Tetsuo knows very well how swift Shiho is to get back to him, so he was already a bit puzzled that it was Kaoru who'd shown up to see him, instead. That surprise hadn't taken long to shade into dread once he'd realized she wasn't really her usual cheerful self, even before she'd brought herself to say anything about Shiho. At least her simply vanishing without a sound implies she's probably more or less okay, wherever she is--or at least she was when they lost contact. He does his best not to turn his scowl on Kaoru, since she's not the object of the anger that boils up over that initial spike of fear, and he runs a hand through his hair, almost palpably tense.

"...oi, 'course I'm goin'. Tch, couldn't keep me 'way if y'wanted to. ......an' if some sonovabitch hurt'er..."

He trails off at that, glaring off to the side, and shakes his head. Cheerful, friendly Kaoru probably doesn't need to hear the kinds of things on his mind at the moment. As much as he's usually an easygoing ray of sunshine eager to help out, there's another facet nearer the surface right now that matches very well with Shiho's ruthlessly protective side.

"...anyways, y'ain't gotta ask twice. Let's get goin'."