Dad recently had a scuffle with a caregiver at his ALF. Since then he has not been in his right mind. Normal?

He had a huge gash on arm. They initially gave him Seroquel after the episode. He was like a zombie at that point. He continued to be out of it until another worker took the next shift (1week). She said she was not giving him the medicine and he was doing fine. I took him and my mom (she also has Alzheimer's) out to see another ALF facility and he was doing great. I made arrangements to have them transferred the next month because this was the second time dad and this one particular worker had fought with dad getting a gash both times. Once on head and once on arm. (Bad gashes). They sent in another worker and m&d only needed to make it to the 30th to be moved. I went over on Christmas and mom and worker were at table. Worker was eating and mom had no fork to eat. I asked where dad was and she said he was being difficult. I went in room and he was lying on the floor with his head on point of dresser. I tried talking with him and he was out of it. Got him up and to table and he fed himself (very difficult). Ate good. Could not carry on conversation or walk. Can a person with Alzheimer's change so dramatically from this exchange in 3 weeks?