Stick grenade to wall, then forward triangle, jump, up square.
The difference Is that, if you watched my Wrath of the Helghast combo video, is that planting a grenade isn't the most practical and mostly for style. Emmett will only have AP bursts off of walls just like Radec at this point. I have other AP Bursts with Emmett but they're not practical.
Then why doesn't it happen offline?
Im pretty sure that was a design choice and not a glitch.
at least its something, need to find a decent combo without a wall which will probably be impossible, but i swear their is a good combo off his up grab because i was messing with his level 2 and was just up grabbing to look for a combo and somehow got 130ap (including the ap i got from the up grab). I believe i was able to do his up square twice off the up grab.