Themis did not possess clairvoyance of any sort. While he was able to predict and assume much, none of that was born from any sort of precognitive abilities. So when he passes Byleth's home upon one of his patrols, he pauses entirely out of an emotional response. An intuition.

A feeling. An instinct to check.

That instinct paid of instantly when he made his way inside to see the aftermath of an attack. A mess. Byleth, upon the floor- the slam of the door behind him is followed by the clatter of discarded weaponry as his staff hits the ground. Themis pulls Byleth into his lap with his shield-arm, gently passing his hand to check for injury.

Instinct flickers again, and Themis knows to trust it utterly.

His sword comes up just in time to skewer the Intellect Devourer that he had missed in his haste to get to one he cared so deeply for. With a soft curse, he pulls his sword free and watches the thing begin to die. His wings come up to shield them both before the detonation hits-

And with it, memory.