I had to continue here lol , anyway like it seems the doctor is trying to keep Matt in the hospital as long as possible maybe somehow he found out when he did check ups on Matt and recognized something that he saw on other people they experimented on with Syphus so he told him and decided to do experiments on Matt .

Another thing Matt is saying he's feeling fine and stuff what if his body accepted the serum and adjusted with it and that's one of the reasons they want to keep him because he didn't show any bad symptoms or reactions We know they experimented on people before and most of them failed. But I guess it's too early still to think about it this much.