Startled by a second, new voice in his head, Illim frowns and turns around, in accordance with Derrel's wishes. "Who are--?" he blinks in surprise at the Andalite. Still huffing for breath, he murmurs, "Pardon me, just a sec," and trots the rest of the distance to Serid, who is watching him--and Efaen even more--with sleepy interest.
"Serid, don't go in there. The uh... you know, the... alarm system," Illim says lamely, not wanting to overtly give away the fact he's a Yeerk to this seemingly helpful Andalite. Fortunately, the Madra is not a common enough design that they just might be able to pull it off.
"Oh," Serid's eyes fix on Illim and widen, and he nods slowly. "Yes, thank you." He looks towards the ship for a moment before returning his attention to the Yeerk. "Who is your friend?"