Something similar to a Super Puma in the North Sea 30 years ago. 2 main rotor blades each lost part of their structure following a lightning strike and whilst there was a lot of vibration, the amount lost on both sides was fairly equal, so it stayed flying. Lightning works in mysterious ways - Maybe we should always have even numbers of main and tail rotor blades!
https://aviation-safety.net/wikibase/75393
Examination of the main rotor blades revealed that all four had suffered extensive damage and two diametrically opposite blade tips were badly damaged, each losing about 40% of their area