Ah, okay. That makes sense. When interpreted literally the rule made it seem like lightspeed warping was possible. This makes retreating much more dangerous and bidding more exciting. Because if I am forced to retreat and the next bidding round that same opponent wins Poseidon, he can just move in and finish me off.
And now I'm rambling. Thanks for the reply!
He can finish you off same round just by paying 1 more GP for each ship you have left. He can also block your retreat posisions by speading his ships.
Now I don't have time to search the answer but wasn't somere stated that you cannot retreat to a sea space from which attacking ships were coming?