Reply to Re: Wait times
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Wait() will always wait at least 2 frames, so there might be a frame after explosion ending and script continuing; while move_stop (with suitably low sp_timing) will allow the script to make a check every frame.
So wait will work, but there might be a one frame between the explosion ending and the script detecting it.
Edit: actually there might also be one frame delay before move_stop-using script detects explosion ending, if the detector sprite and the explosion are on wrong order on sprite list... and it also requires that the detection script is attached to the sprite. So it might make sense to just use wait just for the simplicity.
So wait will work, but there might be a one frame between the explosion ending and the script detecting it.
Edit: actually there might also be one frame delay before move_stop-using script detects explosion ending, if the detector sprite and the explosion are on wrong order on sprite list... and it also requires that the detection script is attached to the sprite. So it might make sense to just use wait just for the simplicity.