Of course Shiryuu's laughing.., look at Garp, he's built for this brawling shit, hell.., he could go trading punch with Kuzan ALL DAY and still be fine, he trained his entire life for that, but not stabbing wound, for just a normal man with no fruit or whatsoever that shit is lethal, no matter how strong you are. Once you get stabbed the COUNTDOWN STARTS.., internal/external bleeding will rob his strength.., so to finally deal the crucial blow and turning the tide of the battle, he knew that GARP IS DONE, only matters of time now...