Trowa didn't think he needed to ask-- the gunshot had come from behind and above the bar. Assuming that was Ehmoi's home and safe place, which he'd tried (relatively unsuccessfully, he'd fallen out of the thing and almost gotten himself shot by falling on the gun, leaving Trowa alive and capable of eliminating the threat) to defend. All the same, this place might have another loft. Unlikely, but it could.
Besides. It made people more comfortable when you asked. Une had told him that.