Zombies grow to Zombie Hulks?

[clintbellanger]

Sometimes zombies can get out of reach of the player by draining health faster than the player can deal damage.

This is probably a bug, but it makes the fight possibly interesting if you know about it happening. So after a certain HP threshhold they should grow into a tougher zombie. Hopefully this could signal to the player that they should GTFO.

Maybe this can be a feature of all health-stealing enemies...