This video reportedly shows a police officer at the Capitol on J6 accidentally fire a tear gas canister into police lines and into the wind, causing officers at the bottom of the steps to the Capitol to retreat:
[Warning: Language]
There's more that happened than just one guy's misfire, but you'd think Nancy Pelosi would have mentioned this when she hired a movie producer to produce the whole J6 Committee coverage in Congress for two years straight.
There's a massive difference between "rioters that stormed the Capitol" and "protesters that were given space and permission to go into the Capitol."