Subliminal Ryoko (Tenchi Muyo)

In the episode "A Cold Day in Furinkan" there is a single frame of what appears to be Ryoko from Tenchi Muyo! Here it is http://i452.photobucket.com/albums/qq246/VIsraWratS/RanmaRyoko.jpg. It flashes quickly when Ranma first kicks the snow monster.

If the air dates I read are correct, this episode aired 8 months before Tenchi Muyo! was released.