@bellingcat "ORANGE & TEAL" (O&T) was present at the door/steps and joined in the attack on the cop, along with others that Twitter users have nicknamed Caveman, CAT, and Scallops.
See YouTuber "Just Another Channel" video from approx 0:58:00 to 1:05:28.
@bellingcat O&T wearing heavy canvas coat, orangeish khaki, emerald green ("teal") backpack, and black helmet.
At 0:58:08 see O&T side profile. Backpack has thick padded back strap.
At 0:59:11 O&T turns to camera. Possibly wearing a stretchy fabric "Guy Fawkes" mask under dark helmet.
@bellingcat Around 1:04:00, men come down left of stairs after being maced. "Squirter" sprays water into their eyes from a small clear water bottle, to rinse out mace.