Edge caseWhen both teams foul in the same sequence
Fans often expect the penalties to cancel each other in a simple one-for-one way. That is not always how it works. Officials still separate when the fouls happened, whether one was already delayed, whether one is a misconduct-only sanction, and which penalties actually affect on-ice strength.
Common argument"Why wasn't the play blown dead right away?"
Because on a standard delayed penalty, the referee waits for the offending team to gain control. That lets the attacking team keep a live advantage and often pull the goalie for an extra skater before the stoppage finally comes.