This raises two issues, the first being that they now had to bring female staff over(just in case a change of mind was made when inside). This meant that the number of female staff available covering the women's facilities was reduced, increasing the risk to those using them should something happen.
Why would you need female staff to police the men's toilets? Minors are usually taken to the toilet by women in my experience.
One female staff member attacked, and off work due to the injuries suffered in the attack at the hands of a women who kicked off upon leaving the men's facilities. He now has the paperwork to sort out.
So a member of staff had a go at a woman for using the men's toilets because the ladies toilets were, as usual, inadequate and under resourced, and that resulted in a fight?
TBH it just sounds like a problem that has been created for the sake of it.
If you are providing toilet facilities you have three types:-
1) Cubicles for people who need to sit. These are usually individual units with locking doors and can thus be unisex.
2) Urinals for men who can stand and point. These can be fitted into a much more concentrated unit, thus making more space for No.1
3) Female Urinals - these now exist and help to reduce the queues for No.1
Stop providing cubicles that are just for men or just for women. Problem solved.