[From here]

Scar didn't bother to check to see if the rest of the group was following. He marched into the stairwell, shining his light into the new area as he made his way up. The farther they got from the rooms, the more dangerous it became.

[from here]

He paused at the stairs, turning his head to catch a glimpse of Castiel behind him. Was the man really up for this? Unfortunately, Soushi couldn't afford to lose another night. It was hard enough to keep from dwelling on just how many days, hours, minutes, and seconds it had been since he last saw Ririchiyo. If this was one step closer to her, he would take it, regardless of risk.

Soushi didn't waste time with words, and instead followed Castiel's lighted path up the stairs.