Council of Elrond

Fell Turtle wrote:Animals. One strike. If any strike is successful, the defending company must return to its site of origin (defending characters are wounded normally).

Drowning Deeps wrote:Opponent may play as an automatic-attack one non-unique hazard creature from his hand normally keyed to Coastal Seas.

Theoretically, if I use Fell Turtle as the second AA and it succeeds, the defending company would have to return to its site of origin if it had one, right?

Right. However practically the company has not a site of origin at this point (in site phase).