As Maura jumps, Eko shouts -
"Shout if I need to pull Kiryu to safety!"
Can I sneak that in before she jumps in the hopes of getting a reply on what is now my turn?
If so, great - I'll react accordingly on my turn. (and follow up with a different action if there's no shout)
If the GM says no, I'll ready an action to yank the rope and pull Kiryu to safety if Maura shouts that I should.