OP8 Digistruct fastball Axton solo practice run

Trying to kill every enemy with fastballs, so I'm using a modded Axton with unlimited grenades. I screwed up on one Saturn & a Scorch hopped the wall, but I think I pretty much got the rest of them. BORDERLANDS: THE HANDSOME COLLECTION REV2 https://store.playstation.com/#!/en-us/tid=CUSA02893_00