"Now-that-Ithink-about-it, Forlorn-troopers-are-very-mass-produced, we-used-them-when-traditional-warfare-was-unrewarding. Get-ready. Purifier-grenades-only work-if-the-target's-down. Gotta-do-this-fast-and-quick, and-if-you-get-any-stuff-on-you, biotic-it-off." Grabbing another type of grenade off his body, Mechanist pulled the pin, then threw it at the door. Apparently a multistage shaped charge, it blew through the door, and definitely would do damage to anything immediately on the other side.