Whereas Felix would say they're both speaking some variant of Cyrodilic, so it might be a question of perspective. Unfortunately for her, his expression isn't getting any clearer.

"And where is that in relation to the rest of Tamriel?" He's working off the mirror assumption of hers: they basically understand each other, and it's more reasonable to assume a shorter teleport than one from- who knows, Yokuda or somewhere. From what he knows, teleportation spells have a fair bit in common with conjuration magic, so that kind of explains what he sensed. It still felt very odd compared to the teleportation points he's seen back home...