If there is damage to your buddy and/or his bike, call the insurance company or broker and report it.

A word of warning to anyone one that does contact their broker or insurance company if they just want to call out of curiousity. The insurnace company can use the information as a "claim" and it can affect your premium at renewal even if you don't plan to submit a claim. It's reported and a matter of record. Especially if there is a police report.

Do not confuse what police determine as fault, with what insurance companies determine as fault. They are not one and the same. The insurance company will review the police report. and statements and may assign fault to both parties. Even though the e-bike rider was charged.

It's possible and likely the e-bike rider may even make a claim themselves.