He's...well, he's still walking. Strange is flagging a bit and not walking as fast as he did when they started but he's still upright and still walking and that's what matters the most. As Solas looks back at him, Strange straightens up as if to somehow prove to the elf that see, he's doing fine, he's got this.

"What exceedingly small faith you have. I'll survive just fine."

No he won't.