What happens if the touch sensor is pressed while a stack is still running?

 

If you press the touch sensor once, the stack attached to the watcher is set off.  If uninterrupted, all the blocks in the stack will be carried out. However, if you happen to press the senor again, before the stack is finished, the stack will start over from the top without executing the rest of the commands.

 
The LEGO Group

 

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