The finale ofX-Men: Apocalypseis a battle royale between the X-Men and Apocalypse and his Horsemen.
One of the more intense (and acrobatic) encounters is between Nicholas Hoults Beast and Olivia Munns Psylocke.
Munn in particular took this scene very seriously.

I knew it was up to me to be able to deliver, says Munn.
So thankfully my fight scene was the last thing we shot.
So when I wasnt on set shooting, I was able to go and train.
The producers and [director] Bryan [Singer] and everyone was so supportive.
I started training six to seven hours a day from stunts to wire work and martial arts and swords.
One thing you cant cheat is sword work.
Hoult says he wasnt necessarily prepared for Munns level of training.
Olivia went to like level-seven ninja, jokes Hoult.
I was so lucky it wasnt a fight for real or she would have definitely done me in.
This was the last thing Munn filmed.
We were literally pushing into overtime, remembers Munn.
Its literally the last hour.
And we had 30 minutes.
That was a scary but very satisfying finish.