From what I read before buying my first LEP Astrolux WP3 (LEP-R or LEP-M, the same type of LEP, if I'm not mistaken ).
There shouldn't any significant blue laser in the beam. So it's just very high intensity light, that can still harm the eye, but just as much as any very bright light.
The damage should be visible, when you close your eyes, you will see light there (but it should fade). If you take 1.5 millions candela in the eye, I would still "see" the eye doctor 
(well, with my private healthcare plan I can visit eye doctor without additional payment, so why wouldn't I go).
But there shouldn't be any significant permanent damage, so you are lucky this time (from what you are writing).
Make a diffuser for your lep just to be safe, and don't leave the side of someone that have LEP in the hands, so they can't harm you or others.
I made diffuser from Rifle Scope Quick Flip Lens Cover with + Matte Window Film https://budgetlightforum.com/t/-/67094/295 around 5-6$ cost with shipping