Escape from Zombie Park Island

[TenOfSwords13]

Mr Yamada, I just botched an autopsy right in front of everyone. That is sufficient explanation for my markings. As for the fact that it had to be someone bitten yesterday, perhaps the reason for a lack of deaths the previous night could be explained by an infection from that zombie? I believe I tended to Isaacs wounds that night, alas he was asleep. What do you have to say?

Just reiterating what I said earlier, in case you thought Isaac could give me an alibi.