Recent Changes in Training Methods

You can fix that glitch by moving maps. It's a visual glitch which I believe occurs on people other than the class of concern. Usually happens on skills that you hold down (rapid-fire skills, BT's fish slap etc). i.e. if you see it, change maps and come back. If your friends see it tell them to move maps.

The one I'm talking about isn't a hold down skill. It's actually dealing damage/killing mobs instantaneously.

Oh I see, thanks for the info. I was worried because I only saw this glitch in towns, but that's different from what you are saying haha