SmashMac let me know about this, I hadn't seen anyone do it this way with a bomb before. It's much better than sidehop left, ess turn down, in my opinion, especially visual cue wise. I use his breathing animation as if getting ready to do a bomb hover as a means of anticipating the 1st explosion frame.
Instant shield drop uses 2nd explosion frame, but is slightly slower since you have to wait to hit the ground to shield drop and it's also losing 1 frame being on 2nd.