Hmmm. Well, having 2 bodies changing size would means:

1-The way Damamud is orbiting Menphina changed from a vertical orboting to a horizontal one, now instead of moving around it start moving in the front/back of it. This change wouls be specially important if they're planning some kind of eclipse between both moons. Dalamud getting behind Menphina would cause it to glow red, while Dalamud in the front would actually make it look like an eye.

2- Dalamud got closer to the planet. But for this to happen it actually won't be a natural satellite...because if such big body get too close it would enter the gravitional field and fall...unless it does is a ship or something.

3- Just like 2, Menphina can get farer from planet.

But the thing is...if the pic is correct then why is Menphina smaller than Dalamud and still in front of it? Or would this just be a triple eclipse? Supposedly if you align the 3 bodies its possible to look like that, with Menphina looking red due Dalamud glow and Dalamud itself looking dark due all sunlight being blocked.

Also...moon eclipse looking like an eye...did anyone say halloween?