Since Genesis is being reimagined, so to say (and this time I swear it's for legit real) I figured I'd post the WIP pages from the Original Comic.
In Genesis canon, Snails became Twilight's first magical apprentice. Turned out the colt wasn't stupid, just nobody ever had the patience to teach him. He picked up on all sorts of sciences very quickly, and eventually became a biologist when he grew up. Married Apple Bloom, who was impressed by his sudden brains.
Twilight is knife-happy.