the same exact thing happened one time! it was pretty much the exact same situation. there were 3 of us and we hit Purple Sticky 29x tho n rounds. me and one friend somehow ended up getting pissed at eachother cause just like you said it got us irritated an pissed we almost started throwing fists and my other friend was trippin the shit out and freakin seeing us abt to kill eachothernot a fan @ all, I tryed it with two friends.. we smoked Purple Sticky Salvia 55x. one would take a hit after the other would come down to ensure somone was sober (sorta) at all times. everyone got a good laugh for the first few minutes and then we all started screaming at each other, everyone was very pissed off and irritated. as for tripping, slight changes in color and coordination but nothing I would compare to the effects of LSD. for me, it was a waste of time, $, and a friday night!
but id say best park abt salvia is seeing other do it really. thats all part of it