A Kid?

Just one of the few D. Gray-Man x Avengers crossovers out there. I wanted to try something new, so here you go! (By the way, I haven't seen AOU yet, so this will just be during the first movie with Loki and an alternative to after Allen fled the Order~)
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Allen walked through the Ark gate, just looking back enough to see Lenalee fall to the ground.
The first place he went to was Mother and Baba's, getting a change of clothing and some money, even after he had politely denied. It wasn't like Mother to do that.
Now he somehow found himself falling through an Ark gate he hadn't opened., subsequently throwing him into unconsciousness.
It was just during another encounter with a hoard of Akuma.
How did this happen?