Is it possible to change Kalista's bound ally?
So my strategy would be to bind with my support during the laning phase, then (why not?) change the bind with a better initiator for team fights. Is it possible to change it, and how?
Solution 1:
No this is not possible.
You can only rebind within 3minutes into the game
http://na.leagueoflegends.com/en/news/game-updates/patch/patch-421-notes#patch-kalista