"Anything in particular?"

[From the moment he walked into the room, Luke extend his senses and was busily collecting. Although he frequently conversed with them (Karkat especially), this was the first Alternian met in person. Overall appearance, vocal patterns, Eridan's own scent and what could be summarized as the trolls' base scent were put to memory. Familiarity with the boy's energy would take time, but among a primarily human topside population, shouldn't be too difficult in 'feeling' him out from the crowd.

Outwardly: Nothing physically obvious to indicate what Luke was doing. Psychic ability/sensitivity in the other party, however, may notice the subtle once-over.]