But seriously.
Play the game you would always play. The best way to avoid a massacre is to keep scoring TD. He may well kill half yr team, but you could (and should) be 3 or 4 nil up by then. Keep out of harm's way. Don't leave any players in tackle zones to be blocked next turn. A failed dodge roll on occasion is not going to hurt as much as a MB chaos dwarf or bull centaur. Play the percentages.
Oh, buy an apothecary if you haven't already got one. You have 13 players, so waiting until after the game to replace cas might be for the best. I really don't think you need another re-roll though. At any point. Well, at least until you have filled out the roster.
Good luck!

*This post may have been made without the use of a hat.