Kalista's ultimate works outside of 1400 range units.
I've been playing Kalista since she was brought to the live servers. Myself and others have enjoyed playing her a lot. Yet there is something that I think should be addressed concerning her ultimate ability. It is simple, she can bring her Oathsworn ally into herself from beyond the range of the ability itself. This renders the opposing team's task of bringing her and her ally down harder than it should be.
If I'm wrong about a technicality of this ultimate ability I would be happy to hear about it. Otherwise this appears to be a gameplay and balance issue.
Thanks for your time.