@ spleen17:
Accidentally initiating the drill at any point is considered taking your turn, making a mistake at the very start of your turn isn't any worse or any better than missing the target by mistake or pressing enter at the wrong time, personally, I will never accept rethrows like this.
The only exception I make is if a player is AFK their entire turn or they don't complete their turn due to an emergency or something urgent, for example, you connect to wall, start moving the rope, something happens and you immediately stop controlling your worm, so the worm just hangs there on rope until time runs out, I also allow rethrows for this.
But yeah, any mistake is void, regardless of where and when.