Grendel Pulverize Bug

[(XBOX)Cosmic Dovah]

While pulverize is active if Grendel gets close to a ledge that would normally trigger a mantle animation the animation doesn't happen (as he is a ball and cannot mantle) and he will remain in ball form and the joysticks will still let you roll around, but the jump button will no longer work (as well as some others I believe). When he runs out of energy he will immediately be teleported back to the location of the mantle and will complete that animation. This has happened to me twice so far and this is what I believe is going on.

[Robot_piloting_a_Mech]

This has happened to me several times on PC as well with all the same symptoms.  I've also found that I can't cast abilities (as you mentioned, I must be stuck in a mantling state), so I can't enter operator form or even cancel pulverize.  I can still use the joystick to roll around, but have to wait until my energy runs out before I can do anything else.