when you check ninja tab and see your lineup, theres move 1-4. in battle move 1 will ALWAYS go before 2-4, unless your skill is turn based like hidan/sasuke barrier. if you are facing move 1 x move 1 ninja. initiative will play a role in this. otherwise theres no bull* like its random etc. server lag can screw you severaly as it takes a bit of time before game realized you are casting. so its possible with bad connection to be "slower".