The Hunter Exotic Calibans Hand makes the Aspect "Knock ´em down"´s last line of abilities not work anymore. Throwing Knife kills while radiant should return back melee energy. If you have the proximity knife equipped both parts of the knife (impact + explosion) return the melee energy on kill. If you have Caliban´s Hand equipped this does not work anymore and you will loose your melee energy completely. The other problem is that in the exotic perk description it says: "[...] ignites the target on direct hit", which it clearly does not. It only seems to apply scorch. This makes this exotic way worse than Young Ahamkhara´s Spine and it´s a shame