The only report of an officer down was erroneously attributed to someone beating him with a fire extinguisher. The latest information is that there was no fire extinguisher, but instead he suffered some kind of delayed reaction to a gas canister (fired by the police).
Do you have a link to a reputable source for this? The ones I read still include the fire extinguisher.
Also, if you think cops weren't attacked, think again: https://www.nytimes.com/2021/01/11/us/capitol-mob-violence-p...
1. https://www.lawofficer.com/family-of-fallen-capitol-police-o...
Which quotes: "Two law enforcement sources told the Associated Press that Officer Brian Sicknick, 42, was hit in the head with a fire extinguisher, according to The Post. He later died at a hospital Thursday night"
Link : https://www.lawofficer.com/capitol-rioter-filmed-hitting-off...