I'd call it, at worst, an oversight or human error than a failure of any sort. What I saw in your account is

1. You've assembled physical assets.

2. You know what you can/ cannot do with those assets.

3. You're able react rationally and decisively during the unexpected.
Notice the final two are mental. That's way more crucial than any amount of equipment you can/ do carry.

The injured still received help/ care, learning occurred, and everyone in your vehicle made it home safely. That's more of a win.