A bad ending can really hurt an otherwise great movie (Fury - spoilers)

So I just watched Fury this past week. I had been wanting to see it, and I wish I had seen it in theaters. Anyway, it was awesome and intense up until the scene with the SS battalion. It was entertaining enough, if a bit Hollywood, but then the end when the SS soldier looks under the tank and lets the kid live. It doesn't fit with the rest of the movie at all. None of the scene really but maybe that's just because that last little part was so weird and out of place. I've been wondering what would've been a better ending. Maybe the SS soldier sees him and just puts a bullet in his head and credits roll with the overhead shot of the tank and SS soldiers marching on by or something. But maybe there's a better option out there. How do y'all think it should've ended?

Summary: SS soldier lets kid live after an intensely brutal hour and a half, which completely deflates the mood of the movie. Better ending ideas?