nice game! but i'm still seeing stars for the combo..

anyone can explain about using combo?

anyone knows how to do combo with many kills? coz when i combo, when the mob dies, the combo is off already..

and i got a pop up saying that to train my skills up to the limit, can train with the dummies thingy.. but the dummies out of town does not give any EXP and only drains mana. how does that help? and what's it about?