I had a situation come up in a game where I was making an attack at medium range, my opponent had 2 hull remaining, and I had a red crit, he was worried about a structural, so he wanted me to reroll.
the question came up, can he wait until AFTER I reroll to decide to brace? or does he need to decide before seeing the results of my reroll (if I rolled a double, he'd need to brace to stay alive)
I rerolled, got another crit and it WAS a structural, so it didn't end up mattering, but just wanted to clarify.
I couldn't find anything in the reference guide that was clear about this.