That's a possibility! He'll only be killing on day 5 and is gonna be doing so with Fenris, SF, and Julius and different points in the day before being knocked out by Kanda, but there should be time for them to have a run-in? Giovanni could do an awful lot of killing in the space of just one hour after all, never mind a whole day ;;

How do they measure up and how do you foresee it going?