YEEEEEEEEEEEESSSSSSSSSSSSS!!!! Thank goodness for Dr. Stone's break neck speed of pacing!
This brings up a new question about Why-man that he has to be "unskilled" with precision/the skill levels of a craftsman. In theory, a machine should be able to make microscopic things with precision (we have nanotechnology), but he cannot make the tiny fissures with precision despite futuristic technology. It might not be the whole world, but the one medusa does have to get roughly half the world. It's hard to see and we only get confirmation in the anime, but I'm pretty sure South America is the focal point of the panel of the petri-beam going around the world and it is about 1/4th of the way around the world within that short time.
I'm glad to see various "support" members get a chance to shine. Ukyou has his ears to hear and find the enemies even if they took a nonlinear route. Francois analyzes the situation correctly, and Ginrou is finally breaking through his fears through the help of Matsukaze. PLUS, Suika! I did not expect her to be the savior...and especially since it took the sacrifice of her glasses...she won't be able to see.
But this could be huge because we might get a chapter or two with the side story of "Suika's adventures to revive everyone!" I would kinda like a kiddy story side tangent after so much doom and gloom. The problem is where is the "remaining revival fluid" that Xeno and Stan seem to see?! Stan is stopped by the science team (plus their manual labor support member of Gen). And this is the biggest point because maybe Suika doesn't find it since she might naturally avoid the scary enemies instinctually (without her glasses).
But the biggest answer of the shockwave cannon being the answer is so typical of Dr. Stone. Simple, but fits perfectly.
IF, and big if, there is no other bottle of revival fluid...Suika cannot make it on her own. Great plot development to state that there is some somewhere but never show it to us. The climax has hit, but I think I'm even more curious about how in the world Suika is going to pull this off now.
And this might not even be the best part...since this is pretty long already I think the Why-man stuff should be discussed in the long-term theories section: https://www.voidcentury.club/topic1231.html