Emmett's level 1 takes a solid second to go through it's windup and fire, based on the trailers I don't think it'll have that issue outside of a player taking advantage of walls.
Kat; maybe, it seems to activate pretty quickly and covers a good amount of ground. Depends how long of a delay there is between some of these attacks. Her slide and that stasis field bounce comes to mind.
Potential Hit Confirms-
Emmett- Rift Arm Dash, Aerial Rift Arm Slam, Galloway Revolver, R-Secs Proximity Mine, Aerial R-Secs Mine, Tetranite Grenade, Aerial Tetranite Grenade, Flak Turret, Aerial Flak Turret
Kat- Stasis Field Slam, Gravity Attract, Gravity Repel, Debris Summon, Sliding Kick, Sliding Knee, Aerial Gravity Kick, Quick Kick,
Fresh to death