Longs Drugs review: Not a product

My brother Mark Heuer and I walked into Longs in Keaau Hawaii right around 4:45pm ish on Sunday June 27th 2023. This was yesterday. We came in to pick up his prescription medicine.

My brother has many health issues. We are walking back to the pharmacy when I saw my brothers left foot contact a yellow cardboard like plastic covered square ish sales poster approximately 9x9 inches big that was not supposed to be on the floor and he slipped on it and fell hard and quick onto his left knee and hip. He is very frail. I wanted to file a complaint but my brother said he was in pain but needed to get home as he was very tired from being at the hospital all day. right after this happened I was able to help him right up and a male and female worker came up behind us to offer help but I already had him up. so the female worker gave him a grocery cart to lean on while he hobbled to the pharmacy. Today he calls me and he cannot move. He is bed ridden in pain. I asked him if he wanted me to pick him up so we could file a complaint at the store. He said he was in too much pain so I am filing this complaint here. There is accessible documentation and video footage of everything. What must we do next? This is NOT my PERCEPTION. THESE are the FACTS. I am an eye witness as well as the 2 workers.