I personally don't mind players using spell combos. With a spell duration of 1 round, most of that would have to come from player coordination/use of tactics with another magic user casting those spells. In my games I try to encourage those things, so it's less of a concern.
There will be blood for sure!
Too much for a 3rd level spell,
it could make 6d6 + 18D10 damage and even more.
But blood will be if it is what the DM want.