Heatblast has a way of sticking out in the night - especially to a creature that's nocturnal. Ben is spotted by the Alternian a far ways off, as the troll settles leisurely on the top of a building, watching the alien go.

The amusement, however, lasts for less than half a minute. Then he needs to look closer.

Glowing, blood-like liquid secretes into a pool around him, and as Heatblast gets near, Signless lashes out at him with it like a whip, trying to grab one of his legs and haul him down. Why is anybody's guess, at this point.