This looks like a visual bug to me, at the end of the video I see that the repulsor energy is used and even stopped Meaty Goliath’s charge.
I suggest to try verify your game files: (the steps to do this can be found in the post below)
See if the issue still happens afterwards.
Ya it looks like you just didn’t see the stream from Jacks repulsor. Let us know if Verifying your game files works.
I played a few arenas and the glitch has yet to re-appear. Seems like verifying the integrity helped!