So, I'm level 10, my friend's level 4
Him and I partied up, as we're both new to the game and such

While fighting mobs together, I was getting a bonus slither of exp whenever we killed something- It was like 90 exp with a (15 exp) bonus
Was that because we were partied, or because I was fighting with a lower level, or?
There was no chain or rested bonus

Also, him and I were in the same map, zone, what have you, and I was randomly receiving drops while he was getting kills
Is that the system for loot sharing?

Two real nooblet questions, I know, but thank you in advance for any and all help