Bear Trap + Shield Charge bug?

I noticed if you use shield charge when locked by a bear trap... you "use" shield charge extremely fast and burn your mana quickly... however this mana is just wasted... because you dont use Shield Charge at all... you just make some buggy animation because you cant really use shield charge when locked by a bear trap... this mana cost needs to be removed OR allow us to use shield charge when locked by a bear trap. (Just like leap slam.)

You can simply test this bug in PvP... get locked by a bear trap and attempt to use Shield Charge.