The giant man thoroughly stomped the zombie, and then started to turn away. Marcus' relief was short lived, though, when he turned back towards him. At least, until he noticed that he was carrying a first aid kit.

"I don't need that." He gasped out. "I'm not injured."

It wouldn't help at all with his lungs. Whatever or whoever this giant was, he was at least not hostile, and apparently even helpful. Some anti-zombie creation to keep an outbreak like this from getting out of control? They were a little late on that front of that was the case, but Marcus wasn't going to question his unusual help when he had no other options at the moment.

For now he just needed to catch his breath. Which he sank to the floor to sit and make it a little easier on himself.