Oddly enough, it only specifies the 'short range' part in the specialization tree and is absent in the full readout in the talent chapter. It could be an error, but I don't know which section is correct.
I believe the version in the tree is incorrect, as it doesn't indicate any way in which the character could actually hit the target at short range. If it did, however, it would not "stack" with Duelist's Training, which specificies "when engaged with one opponent." (I take "engaged" here to mean "in engaged range", though it could also mean "in combat with".)
If it was intentional I assumed it was reflecting the Makashi Duelist using quick/fancy footwork to approach their opponent from short range into engaged range, attack, and then back out of engaged range into short range as one Action. But again, the part where it mentions short range could easily be an error.