I think it went like: first turn distracting strike, commander's strike to get the rogue's advantaged 10d6 attack, crit, 4th attack for free from GWM. Action surge, three more attacks all hit (two more precision dice). Something like 150 damage, having used 4 of 6 superiority dice, bonus action, and the rogue's reaction, maybe a luck die, too.
Rogue's turn is bonus action hide then sneak attack, 45 damage.
Pit fiend almost takes out the rogue in one turn.
Second turn 4 attacks (war priest) all hit (channel divinity and another precision die), something like 100 damage.