Joe is a soft target. You can bring him down or just wait a little longer and watch him continue to fall on his own from self-inflicted wounds. Ditto for Bernie although a little longer - quite a bit longer, actually but the same end point.
The hard core nude mud wrestling and hand to hand combat will be between Pocahontas and Skankala Harris. If one does not take the other down, that person is not going down, so they have to do the deed and make the kill. Lots of entertainment value there. Warren has a bit of an edge over Harris because Harris is stupid. But there will be plenty of blood. And that's fine.
Warren and Harris were separated in this debate. Let's see what happens but still Warren and Harris have nothing to attack each other on. Biden is their co-enemy as the leader in the polls so goign aftger each other like the GOP candidates did, just raises the poll leader higher. How are Warren and Harris different? Not by much so no reason to attack each other until deep in primaries when one sees the other pulling ahead.