Wear a helmet and discard the broken one
On June 17-18th 2023, I was participating in a gravel ultramarathon. Ironically, the crash occurred on asphalt. As I was in a race, I was riding a Vado SL pretty fast, some 30 km/h. While negotiating a speed bump, I tried to go around the obstacle (wrong!), the front wheel got jammed and I crashed with the full force to the right.
I must have banged my helmeted head against the curb. Nonetheless, I was so full of adrenalin I got up, mounted the e-bike and continued racing. I was in a kind of coma, only seeing the track on my Wahoo but dreaming bad dreams. Fortunately, I was stopped by my brother (who was monitoring me on Strava Beacon and was cruising with his car around), and by two cycling witnesses. They forced me to sit on a bench so I could regain my senses. I'm sure I got some concussion as the outcome of the crash. Fortunately, I was able to ride after a half an hour rest.
Only on last Sunday, my close friend took a deeper look at my helmet. He showed a long crack in the Styrofoam lining on the banged side of the helmet (the crack was hidden behind the helmet internals). Yes, the helmet is only good as a wall ornament now. Well, it was an expensive one but it fulfilled its role. If the helmet cracked, my unprotected skull would have cracked without it, or I could expect a brain damage.
Wear a helmet and discard the broken one!
P.S. Whenever helmets are discussed in bicycle fora, it is a rare situation a helmet can be really tested. In my case, I can recommend the Specialized Echelon II MIPS to anyone!