How do you propose they balance it then? Shields will negate the energy drain from BD, regardless of what they decide to do with DH's legendary. That means BD drains, at most, 300 energy.
Ignoring tertiary stats on Majors, Medusa + Dungeon Man can hit 1128 SE. So if Horse shield blocks 50% energy drain from BD, then Medusa starts with 978 SE (unless she has SE on a major, in which case still 1,000) and a single tick from Cyclops = stun.
Horse, Dusa, Dman, Cyclops + 1 other (wolf? moon? witch? kraken?) and the fight is over.