Go to the BP_AIMasterHoldable and in the event graph create a new custom event called Multicast Melee Emitter. Set it to Multicast and tick reliable. Then add an input called Hit and set the variable type to Hit Result.
Next create a new variable called Melee Emitters and copy this video (Video)
Next copy the image shown below.
Next go to the Melee Hit function and add a new input called Hit and set the type to Hit Result then compile and copy the image below.
Next go to the Update Melee Hit function and connect the Array Element to the Hit pin like shown in the image below.