[DannyTN]

"David’s Sling! Love that name!"

I like it too. But it seems misapplied. David's sling wasn't a defensive weapon that was used to block attacks. It was a deadly weapon that struck a highly accurate deathblow to David's enemies.

Maybe there is an offensive capability here they aren't telling us about.

[MrB]

Well... it was a “knockout” or “knockdown” blow.
The giant’s own sword provided the means for the death blow.