When you use a 1TU Move, the opponent monster also goes down by 1 sec (to 1sec) meaning both the opponent monster and your monster are now on 1sec, and then a tiebreaker decides who should go first.
When you use a 1TU Move, the opponent monster also goes down by 1 sec (to 1sec) meaning both the opponent monster and your monster are now on 1sec, and then a tiebreaker decides who should go first.