User blog comment:Real Godisme/Chapter 481/@comment-5303512-20160411121010/@comment-24546844-20160411135528

Mermaids don't know CPR because they breathe underwater.

Anyway, same goes for the Levy CPR to Gajeel but like in that time we all know that wasn't the point of the scene. I'm sure Hiro does this because he loves to see the reactions of the fandom. This whole chapter was dedicated to this.