Poor Aerith never had to exert herself this much before.
Wait, you mean Cid looks unfazed? He's not even cussing! As for Vincent, hell yeah. His body-generated coolness guarantees his survival under his cape of infrared-rays-attraction.
And you just know Cloud's going to keel over hours after his body started screaming at him to, and without ever telling anyone he's about to die of sunstroke.