Is it possible to change Kalista's bound ally?

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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?
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Can Kalista buy another black spear?
The player can re-buy the spear at the shop in the first three minutes of the early game to ensure that in case there was a wrong binding at start game or if the player forgot while they were buying items they can still bind.Can Kalista rebind in Aram?
So, i was playing ARAM yesterday, on my team we had Kalista and her oathsworn, Nunu. Nunu had some connection problems, and he disconnected. Kalista regained the black spear thingy on her inventory, and i told her to bind me.How does Kalista Black Spear work?
Passive: When Kalista is near her Oathsworn, she gains +[0]% Attack Speed. If they both basic attack the same target, she deals 5/7.5/10/12.5/15% of their max health as magic damage. 10 second cooldown per target. It allows Kalista take out her frustration by physically killing the support.What does Kalista Oathsworn do?
Kalista teleports the Oathsworn ally to herself. They gain the ability to dash toward a position, knocking enemy champions back.Undocumented Change on Kalista's W
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