Surprised so many people are saying this isn't a foul. Total roughing in my opinion.
Bad snap. Punter bobbles it. Punter gains control and immediately kicks it.
Nothing in that sequence suggests that the kicker's protection should have ended.
He's facing sideways, but so what? Rugby style punters face sideways; so long as they dont carry the ball outside the tacklebox, they don't lose their protection.
Bad snaps, high snaps, muffed snaps, etc. are double edged swords for team B. Yes, their chances of blocking the punt--or tackling the punter before he punts the ball--increase. But it's a big risk/reward. Because if they whiff on the block, there's an increased chance that they'll rough.