Cool setpiece. I've even got "kill jotun" achievement from it despite doing nothing. Order guys probably could've won the engagement if they rushed the last few GK neophytes left, but they just bundled up in their fortification and stood there in a line.
Are all gatekeepers "bring lasers or go home"? Even fucking neophytes take 3 thumper shots to the face and mystagogues are extra annoying blocking my stealth sniper rifle shots with their "lol doesn't count" shield.