It would be slashing this tail back and forth.

它会前后挥砍尾巴。

The Gastonia roars in pain and tries to maneuver his tail back into position, but the Utahraptor has leaped aside.

加斯顿龙痛得怒吼，努力把尾巴摆到这一边，不过犹他盗龙已经跳开了。