The breathing, thankfully, is a sound he catches easily enough. The lack of heartbeat though is concerning, which- He'll have to ask about that later, perhaps, when he's sure that the man is alright. He does respond a moment later and that brings a wave of relief over the boy that is plain on his features.

Unfortunately, it doesn't last long. The blond follows the line of Byleth's arm to the creature now swiftly approaching. He doesn't have a weapon on him, but makes due with a snap of wooden furniture - a chair, he thinks - and using it as a blunt club. Combined with his strength, it's enough to kill the creature on impact.

But that presents another unfortunate problem: the psionic blast. He knows of it, by now, and quickly does his best to shield Byleth and himself both from it but unfortunately it still scrambles his mind with memories that are not his or of him. Well, not as he knows himself.

The mature man that passes by his mind's eye is clearly him. Older, slightly taller, broader and one eye covered with a patch. A war injury, perhaps? His hair hangs longer around his shoulders but is partly kept up in a half-ponytail and he's wearing much more casual attire than he can imagine himself in otherwise. He lives in a house, not unlike this one, but quickly realizes it's a home with Byleth and others and- Oh.

Those sure are some intimate moments he's getting a glimpse of now. That's- He- Hm. Give him a moment to recover from the blast but also process all of that suddenly being beamed into his brain.