Nice approach.Yes...thats right....he should wait until the previous prisoner is standing in his raw and took his position.
Wolfgang, I think the point that asks for clarification is this:
Must each prisoner wait, outside the room and blindfolded, until previous prisoners have taken their positions?Spoiler for in this case...
I agree tho that the warden might object.
Also, wouldn't the nineteenth prisoner also need to execute this [seemingly one-time-only] ploy?