When an enemy disengages one of your allies in combat, does this provoke an opportunity attack for all PCs that can see the enemy and respond (i.e. weapon ready) including with long-range attacks like from a range with a readied bow, or is it that only the PC that the enemy was in melee with at the time of disengaging gets an opportunity attack?
For example: Say there is a monk in melee combat with the enemy, a ranger about 50 feet away with a readied longbow, and a sorcerer about 45 feet away with the War Caster feat and an attack spell with a range of 60 feet. Would the sorcerer be able to cast a long-range reaction attack spell and would the ranger get an attack of opportunity in response if the enemy disengages the monk?