Havok's power output is off the charts for a non-herald. Even his LOWEST level blast stung Rogue with Ms. Marvel's power badly. If he cut loose, I don't think many non herald level beings could survive it.
WM
Wonder ManMost Powerful Avenger
If Captain Britain wrapped around like Gentle did to the Nuclear reactor he might be able to subterfuge and squish Havok like a 🍇 grape. Amadeus Cho could do it.