I have seen several clarifying posts about flanking, but I'm unable to find this one specifically addressed.
Are the PCs flanking the ksarik?
The rules mention "opposite border". I always interpreted it to mean borders of squares, meaning that Large creatures have two "borders" per side, 8 in total. In my interpretation, they are not flanking. One would have to move down 5' to flank.
My player interpreted "border" to mean the entire side, so to him they are flanking.
This isn't about GM vs player - I just want to know which is the intended correct rule when flanking large creatures.
Thank you in advance for your input!