diff --git a/src/main/scala/li/cil/oc/common/tileentity/Robot.scala b/src/main/scala/li/cil/oc/common/tileentity/Robot.scala
index 04a696d61..e9c8c5261 100644
--- a/src/main/scala/li/cil/oc/common/tileentity/Robot.scala
+++ b/src/main/scala/li/cil/oc/common/tileentity/Robot.scala
@@ -19,6 +19,8 @@ import net.minecraft.nbt.NBTTagCompound
 import net.minecraft.util.ChatMessageComponent
 import net.minecraftforge.common.ForgeDirection
 import scala.io.Source
+import net.minecraftforge.fluids.{BlockFluidBase, FluidRegistry}
+import net.minecraft.block.{BlockFlowing, Block}
 
 // Implementation note: this tile entity is never directly added to the world.
 // It is always wrapped by a `RobotProxy` tile entity, which forwards any
@@ -195,7 +197,18 @@ class Robot(val isRemote: Boolean) extends traits.Computer with traits.TextBuffe
         else {
           // If we broke some replaceable block (like grass) play its break sound.
           if (blockId > 0) {
-            world.playAuxSFX(2001, nx, ny, nz, blockId + (metadata << 12))
+            val block = Block.blocksList(blockId)
+            if (block != null) {
+              if (FluidRegistry.lookupFluidForBlock(block) == null &&
+                !block.isInstanceOf[BlockFluidBase] &&
+                !block.isInstanceOf[BlockFlowing]) {
+                world.playAuxSFX(2001, nx, ny, nz, blockId + (metadata << 12))
+              }
+              else {
+                world.playSound(nx + 0.5, ny + 0.5, nz + 0.5, "liquid.water",
+                  world.rand.nextFloat * 0.25F + 0.75F, world.rand.nextFloat * 1.0F + 0.5F, false)
+              }
+            }
           }
           world.markBlockForRenderUpdate(ox, oy, oz)
           world.markBlockForRenderUpdate(nx, ny, nz)
diff --git a/src/main/scala/li/cil/oc/server/component/robot/Robot.scala b/src/main/scala/li/cil/oc/server/component/robot/Robot.scala
index 49af11d60..b3ae87def 100644
--- a/src/main/scala/li/cil/oc/server/component/robot/Robot.scala
+++ b/src/main/scala/li/cil/oc/server/component/robot/Robot.scala
@@ -248,8 +248,8 @@ class Robot(val robot: tileentity.Robot) extends ManagedComponent {
           val (bx, by, bz, hx, hy, hz) = clickParamsFromHit(hit)
           player.placeBlock(robot.selectedSlot, bx, by, bz, hit.sideHit, hx, hy, hz)
         case None if hasAngelUpgrade && player.closestEntity[Entity]().isEmpty =>
-          val (bx, by, bz, hx, hy, hz) = clickParamsFromFacing(facing, side)
-          player.placeBlock(robot.selectedSlot, bx, by, bz, side.getOpposite.ordinal, hx, hy, hz)
+          val (bx, by, bz, hx, hy, hz) = clickParamsForPlace(facing)
+          player.placeBlock(robot.selectedSlot, bx, by, bz, facing.ordinal, hx, hy, hz)
         case _ => false
       }
       player.setSneaking(false)
@@ -461,8 +461,13 @@ class Robot(val robot: tileentity.Robot) extends ManagedComponent {
           activationResult(player.activateBlockOrUseItem(bx, by, bz, hit.sideHit, hx, hy, hz, duration))
         case _ =>
           (if (hasAngelUpgrade) {
-            val (bx, by, bz, hx, hy, hz) = clickParamsFromFacing(facing, side)
-            player.activateBlockOrUseItem(bx, by, bz, side.getOpposite.ordinal, hx, hy, hz, duration)
+            val (bx, by, bz, hx, hy, hz) = clickParamsForPlace(facing)
+            if (player.placeBlock(0, bx, by, bz, facing.ordinal, hx, hy, hz))
+              ActivationType.ItemPlaced
+            else {
+              val (bx, by, bz, hx, hy, hz) = clickParamsForItemUse(facing, side)
+              player.activateBlockOrUseItem(bx, by, bz, side.getOpposite.ordinal, hx, hy, hz, duration)
+            }
           } else ActivationType.None) match {
             case ActivationType.None =>
               if (player.useEquippedItem(duration)) {
@@ -614,15 +619,6 @@ class Robot(val robot: tileentity.Robot) extends ManagedComponent {
     }
   }
 
-  private def clickParamsFromFacing(facing: ForgeDirection, side: ForgeDirection) = {
-    (x + facing.offsetX + side.offsetX,
-      y + facing.offsetY + side.offsetY,
-      z + facing.offsetZ + side.offsetZ,
-      0.5f - side.offsetX * 0.5f,
-      0.5f - side.offsetY * 0.5f,
-      0.5f - side.offsetZ * 0.5f)
-  }
-
   private def pick(player: Player, range: Double) = {
     val origin = world.getWorldVec3Pool.getVecFromPool(
       player.posX + player.facing.offsetX * 0.5,
@@ -643,6 +639,22 @@ class Robot(val robot: tileentity.Robot) extends ManagedComponent {
     }
   }
 
+  private def clickParamsForPlace(facing: ForgeDirection) = {
+    (x, y, z,
+      0.5f + facing.offsetX * 0.5f,
+      0.5f + facing.offsetY * 0.5f,
+      0.5f + facing.offsetZ * 0.5f)
+  }
+
+  private def clickParamsForItemUse(facing: ForgeDirection, side: ForgeDirection) = {
+    (x + facing.offsetX + side.offsetX,
+      y + facing.offsetY + side.offsetY,
+      z + facing.offsetZ + side.offsetZ,
+      0.5f - side.offsetX * 0.5f,
+      0.5f - side.offsetY * 0.5f,
+      0.5f - side.offsetZ * 0.5f)
+  }
+
   private def clickParamsFromHit(hit: MovingObjectPosition) = {
     (hit.blockX, hit.blockY, hit.blockZ,
       (hit.hitVec.xCoord - hit.blockX).toFloat,
diff --git a/src/main/scala/li/cil/oc/server/fs/InputStreamFileSystem.scala b/src/main/scala/li/cil/oc/server/fs/InputStreamFileSystem.scala
index f9fa39c5f..9973fe0f4 100644
--- a/src/main/scala/li/cil/oc/server/fs/InputStreamFileSystem.scala
+++ b/src/main/scala/li/cil/oc/server/fs/InputStreamFileSystem.scala
@@ -94,10 +94,10 @@ trait InputStreamFileSystem extends api.fs.FileSystem {
         read(dst.array())
       }
       else {
-        val count = dst.limit - dst.position
+        val count = math.max(0, dst.limit - dst.position)
         val buffer = new Array[Byte](count)
         val n = read(buffer)
-        dst.put(buffer, 0, n)
+        if (n > 0) dst.put(buffer, 0, n)
         n
       }
     }