My opponent controlled a creature with Ward 2. They attempted to kill my creature with a Blasting Jelly. I had one mana open, and paid 5 life to cast Redirect Lightning, attempting to redirect the ability to their own creature. The Arena client gives me a warning when I click on their ward creature that says if I do not pay the ward, the spell will be countered. I dismiss the warning and do it anyway, my spell resolves without any ward triggering, and their creature takes 5 damage.

My understanding of the rules is that the play itself is correct, and since my opponent controlled the ability, the ward cost does not need to be paid. My problem is that if that warning showed up for someone who was less confident in the rules, they might believe that the play wouldn't work and not cast their spell.

I believe the best thing to do would be to disable the ward warning from appearing in this and similar scenarios. The issue is that when I click on their ward creature in this case, I am choosing new targets, NOT targeting it with a spell or ability. That is the distinction that is not being made with the ward warning.