where is the option ...
... to reject the item The Black Spear Active: Offer to bind an ally for the remainder of the game, becoming Oathsworn Allies. Oathsworn empowers you both while near one another. *This item is only available on Kalista
while this may be great for people that play together all the time or are voice together it sucks in random normal. I personally hate when I get ulted from out of the blue and end up somewhere I was not trying to move to. Also I play mostly squishies as support and have no idea why I would want to jump in the midst of enemies and die to maybe -read usually not- get an assist from it.
I have warned several kalistas that I would abandon them if they bound me. All but one ignored me then got mad when I kept my word and abandoned them. the description says "offer" implying I have an option to reject, I have never seen an option to reject.