what is so hard for you to understand? you press the button x times, and you get 2x heals. where do the extra heals come from? they are automated. I dont know about you but i could see from the start how this bug arised:
Ctrl was implemented so that instead of having to double right click to use a skill, u only had to single click. Somehow (and this is the bug), for a spammable skill that you can use as fast as you press the button, it allows 2 instances of the skill to happen for one click. Instead of limiting it to 1 click per skill like they should have, you can do double. Same goes for glitching, if you want to speed glitch with acid pots, you put acid pot on right click, choose a target and spam ctrl right click to go super speed.
It serves the same function as a bannable macro, but it happens to be in the game, so its ok?