The blue-black eyes widened as he saw his colleague - his first contact on the station, his first friend here, really - go down, flesh-bone body (soft, fragile) landing onto the console with a painful-sounding, ugly noise.
What followed was worse, though. Because what followed was a long, loud, broken keen, coming out of the usually so composed man - and Kairos felt the hairs on the back of his neck stand up.
"Commander!" his voicebox stuttered out, spitting out something more akin to a shrill growl than sapient words, and the android took his trembling limbs - fury, fury, fury - forward, his body dipping downwards and then lunging at the aggressor like a sleek bolt, pinning what was once human down.
He ached. The dumb fucking helmet was in the way, so instead his palm gripped around what was once the facial area... and Kairos pummeled the head up and down against the ground, once, twice, thrice - vengeful, vengeful, vengeful - stopping mid-air of what was almost the fourth hit, helmeted head snaking up close to check if the flesh so much as twitched.
Or perhaps it was Rex who urged him to stop.