Is the following legal? If so, what skill check (if any) would I need and at what DC (probably subjective according to DM)?
Summoner's have the Transposition ability which is a standard action. I want to set that as a prepared action for when the Eidolon is 10 feet off the ground. Then my Eidolon jumps off a cliff (say 100 feet), transposes the last 10 feet, then the Summoner only falls 0-10 feet (at which time he can dismiss Eidolon etc).