Being almost 3k years younger would definitely be enough to put the spook in anyone, let's be real here.

Gabriel has a habit of taking in strays, so seeing this guy in a bad spot would definitely ping his 'protector of the people/military man' in him.

I can make a toplevel for us, then! Have Gabe find Romulus looking like he's lost and out of place and ask him what the heck is up, something along those lines? (Maybe near the perimeter so there could even be monster involvement, haha)