They entered the experiment room and locked the door, so that the zombies may not disturb them while finding the cure...

The old man gets the blood samples from different people. He doesn't remember where's Adam's blood in the test tubes. The testing takes an hour, sadly none of the test tubes containing bloods matched to what he's talking about.

The old man looks frustrated because he didn't expect that he lost the other test tubes while running, it might fell somewhere ...