Take a look at effects of attacks and ninjutsus, for example, if one ability chases low flooded enemies (1),then you find a ninja that has low flood effect on an ability (2), after you found that you place 2 before 1 and after 2 attacks 1 will follow up and there's a little combo, like this you can make whole team chain each other and get 20 hit+ combos. I hope you understood what I wanted to say.