His ‘ordering around’ isn't anywhere near as bad as some people's; Sizhui's voice is just a little firmer, more straightforward and no-nonsensical with their goal set. So, for him, pride wasn't even something he'd considered in the moment, though it will be once they've finally gotten around the cabin.

Window discovered, Jiang Cheng doesn't waste time with his sword, instantly drawing the disciple's attention. “Wait, we shouldn't—!” but again, this is wasting time talking since he's already airborne.

It's fine, Sizhui technically won't go inside, which means Jiang Cheng shouldn't be as angry! Though it's rare, gathering his energy to leap just high enough over the fire and land on the other side comes rather easily; somehow, he even manages avoiding singed robes, propels himself forward to the window and latches on. Without looking back for fear of what he'll see (Jiang Cheng's angry is surely worse than fire, right?), he leans in through the makeshift entrance, looks one way then the other—

And he immediately withdraws, backpedals a few steps, empty hand lifting to rub over his face like it'll help cool the heat wafting off the burning cabin. “I can't see anyone!” But now, if the other cultivator so chooses, he can go inside.