Spell Hacker

I have a premise for a story: a guy living in a world of magic, who does not himself have magical ability. But it turns out that spells are like software and almost invariably are buggy. So this fellow learns how to hack the bugs in spells. For example, he and his group are immobilized by a spell but he leans slightly forward and back a few times and cracks himself out, then thinks: "let's see...there usually is a bush somewhere with a...there's one...[he looks underneath the bush]....there it is! This spell is a piece of crap." He fiddles with something....there is a "poof"...and his friends are freed as well.