Csol plays biochemical mode, and some characters have drum tower icons on their heads. What is this?

It is the human skill of the son of the new zombie demon that is accurately killed.

As a human being, pressing R can only be used once in a round, and only for five seconds. The effect is that the zombies killed are all headshots, not headshots upstairs.

As a zombie, pressing G will rush out of the yellow light, and if you hit someone, your weapon will drop (not for heroes). But there is no limit, but there are intervals.