Can Tideturner target a unit at Star Spring after errata?
If I play Tideturner to Star Spring, can Star Spring resolve first moving a unit back, then Tideturner bring the same unit back to Star Spring, ending with Tideturner in base?

The first time a player plays a non-token unit here each turn, they may move another unit they control here to its base.
Artist: Six More Vodka
Card Set: Unleashed
If I play Tideturner to Star Spring, can Star Spring resolve first moving a unit back, then Tideturner bring the same unit back to Star Spring, ending with Tideturner in base?
My opponent attacks a unit of mine that is defending a battlefield, and I win that combat. Does successfully defending during my opponent's turn award me a scoring point for that battlefield?
Player A controls Star Spring. Player B moves in, Player A Ambushes and moves their unit back; Player B conquers and kills the Ambush unit. If Player B then plays a unit to Star Spring, can they trigger it, or has it already been used this turn?
Stellacorn's move trigger is pending on the chain. Can Star Spring choose Stellacorn as a target before all pending items are finalized? How does this compare to Baited Hook killing Ruined Rex mid-resolution with a pending Deathknell?
If I successfully defend a battlefield during a showdown, do I score a point for the defense?