Before 1.27. you were able to heavy punch in sprint → making a step with the fist forward
you had to run continously (8 steps at least in straight linel it used to be 5 before...) and click attack button.

They you would heavy punch in sprint.

Since 1.27. this doesn't work, and it breaks freshie pvp, you can not safely approach enemy with this tactic.
Fist combat is totaly broken now