[It brings different sort of edge, not one of anger or frustration but concern instead, at the brief but telling silence before he speaks. Honestly, he knows Shiro enough that he's never necessarily faulted him for it - especially not lately, not after all he's been through. It never makes Keith worry any less though.]
Shiro... [Sigh, you nerd.] You know I'm here, if there's anything I can do that would help.