The problem occurs when I use it with a bow. Sometimes it keeps channelling until mana is depleted or I use Shift to move away. At that time character doesn’t respond to any moving command. As you can see, this is a very serious problem as for a few precious seconds you are totally stuck in one place, unable to avoid any attack.
I thought it might have been a problem with my hardware but it wasn’t. I tried channelling the skill both with different mouse buttons and also keyboard keys. The result is the same.