^ This. Almost certainly a high dose, it seems common place for most tabs of 25I-NBOMe to be dosed quite high, I've seen tabs with as high as 2mg per tab, and the average seems to be 1-1.2mg. 1mg when pure and consumed correctly is a very strong dose. I can't imagine the crazyness that would follow after 2mg of pure and accurately dosed material, and 3-4mg is just ridiculous.
Be careful with these substances, just because the NBOMe series are legal in many places doesn't make them any safer than other drugs. If your friend really took as high a dose as I expect, you and him are lucky he only went crazy and damaged a bunch of stuff, the NBOMes cause very strong vasoconstriction and elevated blood pressure in high doses - a little too much can put you in hospital or kill you. Don't even consider taking them if you don't know the dosage.
500ug buccal/sublingual is a good place to start, and I don't advise exceeding 1.5mg even if you're a hard-head (much less if you're using other ROAs) - there are other safer drugs you can take if you want that "balls to the wall" experience without putting yourself or others at risk. A small difference in dosage can make a big difference in the effects, for example with 25C-NBOMe, up to 1mg was the perfect dose for me, and I didn't experience any problems, while 1.2mg was way too uncomfortably intense on the come up and caused worryingly high blood pressure.
This is just another reminder of why proper dosage and proper set and setting are vital - and this goes for other drugs too not just psychedelics. If you're not mentally prepared, take too much, or are in an unsafe environment the consequences can be very serious.
Take what happened as a lesson to both of you and please be more careful in future. Stay safe and hope you and your friend are okay