Most Ridiculous Rules in RPGS

[AMFV]

"Immobilized by the weight of their armor" happens to be much more myth than reality.

More likely, those men were already injured in some way, but might have lived had they not been "finished off" by the "dagger-men".

I would suggest that it's possibly a result of concussion or injury from falling off a horse, which is a pretty dangerous thing, especially if you're not adequately padded or protected.

Edit: Just noticed your comment in the other thread, and am in general agreement.