Air-Walker is actively trying to recruit one of the Heroes to Galactus’ side. He does that by giving them Crisis tokens via his BAMs, Master Plan cards, and Overflows. If ever a Hero accumulates 4 tokens, they are turned, and the Heroes lose the game. To try and prevent that, Heroes can help each other by engaging their faltering teammates and spending a couple Heroic Actions to discard one of their Crisis tokens. Attacking Air-Walker is not easy, as his Threats give him Hyperlight Speed that allows him to move away the instant a Hero enters his Location.
https://www.kickstarter.com/projects/cmon/marvel-united-multiverse/posts/3711169
