Ok. Jak has a punch that knocks you on your arse, level 1 super. Whether this is because of lag idk I dont play jak but that's happened to me, I'm sure there's another I'm forgetting. Nariko can use hers after her air disk ( **bleep** I hate that thing) , BD can shock you and do it. He can also grab you and slam you into the littlesister, BA. Ratchet has his vaccuum, and why even try to set up pararrapas when his skateboard never stops?
Ratchet's grab + L1 is NOT a guaranteed kill. It can be avoided if done right,