Sapph's attention snapped up to the surface of the pool to see someone drowning. At that, he shot up from the bottom of the pool, Sakura getting to the old man before he could reach the surface. It was at this point that he felt something hit the bottoms of his feet and shoot him out of the water, most likely Kasier giving him a boost. He landed surprisingly lightly next to Sakura and the old man (who he could swear he's met before). "You don't know how to do CPR? Good thing I come prepared then. Hero! The pump!"
Hero was already a step ahead of his trainer, carrying over, what looked like, a squeaky toy that had a tube sticking out of each side of it. "[You remember which end goes in, right?]" The absol asked as Sapph took the item, which was obviously this pump he called for, and gave it a couple squeezes.
Sapph didn't answer as he set about to work, shoving one of the tubes into the old man's mouth and performing CPR, using the pump instead of the mouth-to-mouth part.
(The way that 'pump' works is it has a 1-way valve in each tube. One lets air in, the other lets it out.
Also, he didn't notice Pyro's being there just yet.)