Loghain isn't Maedhros, but the gesture is simple and Maglor takes the invited place. They seem to have the same errand, and the furry companion is likely to only be a boon. And he senses no recognition beyond the awareness of one soldier of another. It's enough to make it easier to not simply bolt away for fear of discovery and recognition.

"Nay. Having enemies suddenly thrust upon you from all directions. Especially from above- the Enemy was always fond of his dragons and fell-beasts."