[ANIME SPOILERS] "Perfect Game" What could have Erwin done differently?

ask a few scouts to check if any of the houses has a basement underground big enough for people and maybe a horse to hide in. The idea being that staying underground gives protection from the boulders. If the beast decides to use his titans to lure them out then that just means that the cage he made has been broken and they have an easy way to flank him.

If the horses don't survive, so be it. If they somehow manage to kill the beast titan, then they can always send eren to get supplies and reinforcements and eat the remains from the horses in the meantime.

By staying stationed underground like that, Erwin lives, and there's no debate about armin getting the serum (assuming mikasa manages to find them and get it). Reigner also doesn't escape giving them another confirmed kill.

/r/ShingekiNoKyojin Thread