Or you could show it heal in Ben’s hand when he shrugs. You could do it with the audio and e visual of The crackling could just fade out back to normal.
Or like right before he shrugs.
He pulls the blade out and it’s still crackling, it transitions to normal and the audio is where most of this happens. Some sort of healing sound? Then the knights reaction then the shrug.
That would make it seem like Ben healed it. This is all starting to sound very convoluted. Having it crackle the whole film seems to be the best option.