Oops, I rolled the wrong number of dice. I now re-roll the right number of dice.

By markrivett, in X-Wing Rules Questions

Posted at
8 hours ago, Frimmel said:

The heuristic I was taught is the first time is an accident, the second time is a coincidence, the third time is enemy action. So until the third time I do not typically consider it anything other than an accident.

Sounds like a good 'rule of thumb'..