1: Memories are dangerous

Levi sustains an injury in an expedition outside the walls, and for the next six months, Commander Erwin makes sure he doesn't go on any more missions.

The question is why? Even though Levi was now healed, why was Erwin keeping him from going?

Contains:

-spoilers for AOT anime
-spoilers for A Choice With No Regrets OVA
-blood
-swearing
-mentions of death
-male x male ship