It may just be good bud, like Chrons mentioned, but I've never smoked anything that gave me a trip like you've described. If your friend knows the dealer that he got it from, and is confident that he/she wouldn't do something like lacing the product, then you probably just got some buds that were more potent than you are used to.

On the other hand, if your friend doesn't know the dealer very well... if the "crystals" you saw were much more noticeable on certain areas than they were all over the rest of the bud, then you may have bought something that was laced. I've heard about plenty of dealers who added something to their product to make the high more intense, but they generally warn the buyer about it. If the dealer did this, and didn't warn your friend about it, then make sure you and your friend don't buy anything else from that dealer... EVER. It's a common tactic for some shady dealers to add crap to their bags to make shitty grass more "potent", and it's not uncommon to hear that batches are in circulation that have had glass, sand, sugar, or a similar substance added to make the product weigh more.