sub question,2 shoe lace

[mutantducky]

once a player leaves the floor and a sub enter can the first player still come right back in as a sub? say subbed on accident.

also and the way I've been doing it if a players shoes becomes untied I let them know during a break and maybe stop it if there is a lull in the action. Do you ever stop play if a player, especially one on D has their shoe untied?