How does a yellow tang "attack"

[Milad]

So i have a yellow tang,
I just got a fox face and a mimic tang.
I put them in with the yellow tang last night when it was dark.
Yellow tang was sleeping then started crusin the tank.

He found the mimic and just hung out with him for a bit, kinda rubbed up against him, didnt really do much

then it looks like every once in awhile he would back into him and slap him with his tail and the mimic would just be confused and slowly swim away.

he also did this a few times with the foxface. is this how they attack? both mimic and fox face didnt seem bothered, they just casually swam away.