How does Stryfe's Dark Riders Threat interact with Asteroid M's end-of-turn damage?

Question

Accepted Answer

Dark Riders makes the first Thug attacked each turn need 2 damage. Asteroid M defeats a Thug only if an earlier hit this turn already damaged one; with no Thug damaged it defeats none; if a Thug was already defeated this turn, Asteroid M works normally.

Marvel United: X-Men

How does Stryfe's Dark Riders Threat interact with Asteroid M's end-of-turn damage?