Ren looked at Mike as he apparently acquired the First Aid Skill and, judging from his reaction, he wasn't happy. Ren couldn't really keep up with this one, two... noisy in Ren's opinion. He didn't do too well with noisy people, especially since one person who liked to talk decided to talk alot about him and... well... that is a story for another day. Ren stood up and opened his inventory, pulled out one of the bandages in it, and showed it to Mike. "Just get some bandages, items used in typical first aid. You have knowledge of First Aid from your high rank in the skill, so it should be obvious." After that he put the bandage away in his inventory and went back to meditating with the Meditation Skill to recover more of his MP as he waited for Lucian to apply his level ups so that they could get on with grinding. 

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Mike First Aid: 55 - 21 First Aid = 34
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In fact, even without Ren saying that Mike, as Ren said, would know that is indeed the correct answer if he had just taken a moment to think about it, or had a moment to think about it before outwardly expressing his anger towards the Skill.