Ramsay runs back to Winterfell after losing the battle. Jon chases him. Wun Wun breaks into the Winterfell gate looking for Ramsay. Jon gives Wun Wun a wink or some shit, then all of a sudden Wun Wun gets taken out by an arrow to the eye from Ramsay.
So Ramsay will have fought the "greatest Iron Born killers" bare chested, destroyed the greatest military commander in Westeros with 20 men, killed his father, and killed a giant by the end.

