Yea, the AT Field gets explained later.
Well, Rei's dead.
OK, honestly though? Rei running up to the angel with a nuke is almost the single most alpha/LOLWAT thing i've ever seen in anime. It's the equivalent of running up to a guy with a bullet in your hand and attempting to slam it into your opponent's chest.
This scene was pretty BA in the show, let's see what happens.