Unfortunately, if you reference the J. Paul video, he clearly defines Direct Pressure as a COLD BURN-no command just zap. This was my major objection to his explanation.Well I guess one could define it that way because it is certainly direct! However, as we have learned, commands in almost all situations (but not all!) should precede a correction. Thus, the conventional definition of Direct Pressure is a command followed by a nick. In any case, it is not surprising that cold burns cause pops.
I see folks struggling with two other ideas in this thread.
One is the timing after the command. It is not as critical as most think.
What is more important is the timing of the intervention (the command).
Someone talked about a dog being within 15 degrees of a decision. Not sure what that means but I do know the issue IS NOT whether the dog is off-line or not. The issue is whether the dog deviated or refused a command. More precisely, the issue is the decision to deviate or to refuse command. Those are the reasons for intervention with pressure. You don't intervene with pressure just because a dog is off line. This seems to be an elusive idea for some!