Tony had been in hot before, hot was easy. However the Afghanistan deserts usually like to make themselves a terrible dry heat, not an oppressive humid heat.

It turns out that Tony is not at all a fan of humid heat. His hair was all but clinging to his head from his sweating, when he saw Steve remove his coat he stubbornly tried to hold out in his longer, because in his mind he had to prove to them he could easily keep up even though he's not a superhuman or an alien god-like surf commercial. Though taking off the heavy coat hadn't really made his life easier because he still had to carry it along with his pillow case full of his smoke/fart bombs, and the tools he refused to abandon to the melting house. Those things alone were making life hard enough.

Tony was also refusing to think about Natasha's death, while she wasn't the Natasha he knew, she was close enough so he wasn't taking it all which meant he was looking more quiet and determined. If someone with Natasha's skills could be taken out, then Tony was most certainly on borrowed time. His inner contemplation helped him to ignore Thor and Steve's growing conversation. Until the rustling caught his attention, frowning he reaches into his pillow case cautiously.

"I have a great quote for right now. But it'd be lost on both of you." Is all Tony can bring himself to say.