Rules schmooles

Child A is standing across the room refusing a diaper change.
Child B shoves Child A in your direction, resulting in her running over to you.

Normally shoving results in time-out at your house, but then again, you did achieve that diaper change. Do you send Child B to time-out? After all, rules were made to be broken, right?

Dilemmas in double parenting. I have huge respect for parents of multiples.