Jotunheim:Utgard AAR

[Arryn]

Something's been bothering me subconsciously and I finally know what it is. Perhaps someone who's actually tried it can answer this question:

The spell Body Ethereal has an AoE of 1. The Wyrm is size 6, and thus larger than 1 standard square (or at least it looks that way on the pre-battle positioning map). Can a Seithkona still cast BE on the Wyrm, since the target takes up more squares than the BE's AoE of 1?

Bonus question: how many size 2 beings fit within 1 standard square?

TIA.