I think the part the describes what the video was showing.
I take it you're talking about page 4 of 9 so I transcribed that page here:
"1509 - PC runs down the first floor hallway.
1510 - PC climbs the D wing steps to the second floor.
1510 - PC enters classroom A209.
1511 - PC exits classroom A209 with a red hooded sweatshirt over his head. He is seen carryign a gray/yellow backpack, black bag and a purple bag.
1511 - PC is observed exiting downstairs wearing a red hooded sweatshirt over his head. He is seen carrying a gray/yellow backpack, black bag and a purple bag.
1514 - PC is observed wearing a red sweatshirt and was observed pulling a recycle barrel towards the elevator.
1516 - PC is observed wearing a red sweatshirt, exiting the elevator and pulling the recycle barrel into the aforementioned second floor bathroom.
1522 - PC is observed exiting the aforementioned women's bathroom wearing a white t-shirt and black face mask, pulling the recycle barrel to the elevator.
1523 - PC is observed exiting A wing pulling the recycle barrel wearing a white t-shirt, jeans, and a black mask on his forehead.
1525 - PC is observed puling a recycle barrel from behind a dumpster toward the field house.
1532 - PC is observed pulling a recycle barrel away from the field house, passing dumpsters, continuing toward the student parking lot.
1600 - PC is observed entering the A wing doors, wearing a white t-shirt, jeans and barefooted.
1601 - PC is observed wearing jeans on the third floor heading towards his locker.
1604 - PC is observed wearing a black shirt, with glasses, carrying jeans, with a Nike backpack on his back.
1605 - PC is observed entering the aforementioned second floor bathroom, adn then leaves the building through the first floor A wing doors.
Danvers Police Officer Stephanie Wenner?berg subsequently observed red/brown stains consistent with blood in the area of the second floor bathroom. Danvers Police Detective Robert Sullivan also reviewed the video surveillance footage and reported that he observed what appeared to blood on PC's pants after he left the aforementioned second floor women's room."