Zhou Ma knew the matter was of great importance, so she carefully recalled every detail of what happened.
She started from when Chen Zhi went downstairs, slowly recounted everything that happened, and then mentioned that she went to buy mineral water, asking Chen Zhi to watch over Master Si. When she returned with the water, she saw Chen Zhi push the wheelchair over the edge.
After listening to her finish, Si Ye asked, "When you came back with the water, you just happened to see Chen Zhi push the wheelchair down?"
"Yes."
"Did you see how she pushed it?"
Zhou Ma tried to remember, but she couldn't describe Chen Zhi's exact movements, "Young Master, I can't be clear, but I saw her forcefully push the wheelchair, and then it fell down... I don't know what happened after because I was shocked by seeing the master fall, and I didn't pay attention to anything else."