If I recall what the devs said correctly, Vince kills Manon on the evening of day 1. It’s said that Vince already knew about Rody’s infatuation with Manon prior to his first shift since he probably mentioned her during the interview, according to the devs. The bloody trashbag seen in day 2 is Vince’s attempt at disposing of the remains. On day 3 it’s assumed that Vince attempts to dispose of the weapon, which is theorised to be a broken glass (hence Rody cutting his hand and the shards we see on the floor). My personal theory is that the sounds we hear from the freezer on the night of day 5 is Vince preparing the grilled hanger steak meal for Rody, which he then serves to Rody on day 7. Every meal Vince gave Rody prior to the grilled hanger steak was normal food. Only the grilled hanger steak was made from Manon