[That look on his face honestly kind of breaks Keith's heart for the difference and uncertainty it highlights. And though it's hard to feel the full depth of the anxiousness he usually would about it, in here... when he turns he goes to step closer to Shiro at the same time. Keith's voice is still soft and has almost a similar calming purpose to the cave to it when he speaks.]
... Hey. We'll be okay. [Overwhelming as it is - it'll be okay. They can even leave if it's too much, Keith will throw the whole search thing out the window if it means better for Shiro.]