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Sitting down with his hands on his head, Mark took deep breaths continuously to ease the pain he was feeling. Sweat kept rolling down his face and drenching his back, and he could only keep gritting through it. But eventually, he took out the box of tablets from his pockets and swallowed a pill to ease it without water. 

The pill started doing its work immediately, and he sat there on the ground, not moving, only waiting for the pain to ease a little so that he could continue his work. He originally planned to do at least 3 experiments but is now scared from the pain. If he faints on the alleyway, there is no telling how things will go. 

After 15 more minutes of resting, he finally found himself standing by taking the wall support. He dragged his body towards one of the Ac outlets and sat on it. He looked down towards the zombie near his feet and simply kicked it a little.