There's a blitz in the air. Escaping runners is a low priority in a blitz, so leave the runner on the ace point.
Then, my choice is to bring down two so that we have 11 checkers in the zone. 15/8 is certainly sound, but an extra builder seems to be worth the additional risk of leaving the blot where it is. Threes are duplicated so six of the 14 threes don't hit. And with no board, being hit is no big deal.