Gentleness was a virtue, and being unguarded was a sign of abundance. But that only applied when there were none of his kind around. In other words…
"Gotta be sharp."
His feet froze. A prickling heat danced across his bare chest.
Ah, a kindred spirit.
Not quite the same, but close enough. He felt the unmistakable thrum of magical energy.
"Keen senses," he muttered, his voice trailing off as he vanished.
One fluid motion, and he was swallowed by the throngs of Oslo, leaving only silence in his wake. The sudden quiet of the alley amplified the music blasting through his earbuds. Not bad. This metal really got his blood pumping.

Fate/Lost Einherjar, Prologue