User blog comment:Emptylord/Leaked Champion: Vel'Koz/@comment-5788083-20140120111422/@comment-15962904-20140126213831

Depth charge: ACTIVE: Nautilus fires a shockwave that chases a target enemy champion, dealing magic damage and knocking up enemies it passes through.

Maybe Blitz rocket grab say it stun the target, but is considered an airbone ability and can trigger Yasuo's Last Breath