Your job as a teammate, and wrestling drill partner, is to help develop the wrestlers around you. It’s hard to determine whether or not the technique that you are drilling will actually work unless your partner tells you so.
If your partner is drilling a technique that you don’t think will work in a match, tell him… and tell him why. Be constructive with how you communicate. If you let him know what he’s doing wrong, or how it feels to you when defending, he will be able to adjust the technique to make it more successful. Also, be sure to tell your partner what he is doing correctly. If he has been drilling a move that is a sure-fire way to score in a match, tell him!