CA, I ment he is Christian like me, we usualy just repremand each other if we are getting to pridefull. (BTW feel free to do the same to me as well). Listing the fact he was a Christian was just more Chracter background to get the idea of what kind of guy he is, around here it means a lot, and also how I know him. I dearly apologize if I appear arrogant online as that is not at all my intentions, In real life I'm usualy pretty laconinc and laid back, same with 'John'.
The situation ended up the best way it could with the entire thing being swept under the rug. It's a vocational school so small knives are still really frowned upon but moderately common. The whole encounter was only a few seconds and the sling was just the first thing he thought of, and he wasn't really aiming for the head, just trying to stop the guy by throwing at him and getting his attention and stopping the initial attack. And It's not like he was in a coma for a while, he just blacked out for a sec, long enough for the situation to cool down though.
Ask anyone who's been in a serious fist fight or fire fight, You don't "think" in a situation like that, you just act or in his case, react. Your morals, tactics, and motives are decided before and after, not during. And John and I are not the kind of guys that wouldn't act in the case of a guy getting stabbed.
I haven't used them but I would think the general concept of the Rusty Ball is where your best LTL ammo is going to be. Some kind of casing with sand inside that deforems impact.
Paper and duct tape is just a quick easy ammo we used a lot as kids and he felt like making another that morning. Having been hit with one and having also hit 'John' with one (Sling Duels

) just paper and duct tape is like getting hit by a cheap paintball gun. Though if you increased the size up to large egg size it'd probably be more like a high end paintball gun.