Luther goes haring after him — or at least tries to, and lets loose an uncharacteristic "Fuck" as he collides with Diego's bedroom doorway instead. Almost rips the frame out of the wall just with the sheer force of his impact (he doesn't even feel it, himself), before he squeezes himself through and goes thudding through the house after his not-brother. He's slow, and made even slower by his attempts to not break every single damned thing he passes in their house.

By the time he's gotten out to the landing, down the stairs, the front door is already slamming shut and Diego is gone, just gone, as if he was never there.

Luther's left standing in the foyer, his hand on the banister.

"What the fuck," he breathes.