“Was it . . . really a Heroic Spirit?”
“It could also be a monster or wraith . . .” Sigma muttered, but the girl Assassin shook her head.
“No . . . I don’t think so. I did not sense any tremors of malice or hatred from that being. . . . No, I sensed no fluctuations of magical energy at all . . .”
The magecraft-user and Servant remembered how they had both been surprised by that “shadow” when they had woken up in the garden.
If it were hostile, it would already have dispatched them. . . . Considering that they had not been attacked in their sleep, they thought that it might not even recognize them as enemies.

Fate/Strange Fake: Volume 6, Interlude ("Mercenary, Assassin, Pale Rider")