Did you have a fall on the shoulder?....seems weird
I didn't have to, but it has worked out OK in the past. Tuck my elbow in, flex my muscle, then cringe. There was a sign post I wanted to grab, but it was just out of reach. I was afraid of breaking my wrist if I reached for the ground.
On my MTB I can be aggressive about fall mitigation. I'm accustomed to reaching out to grab a tree, or just unclipping and letting the bike fall as I land on my feet. But the tandem is 340 lbs with both riders, and I don't have complete control over it with the active load on back. Slow to start, slow to stop, requiring more active balance correction. And damn hard to stop a fall in progress.
So there -- that's my excuse! I'm just glad my son is fine.