IME only the channa micros and some of the larger ones do the twisting motion.
and they usually only do it,in micros,when there is more than one channa.
they will help each other tear apart prey.
ive seen channa micros and common wolves fight before in my tank.
and most of the time the channa just flared at the wolf and the wolf was more aggressive when fighting.i always feared more for the snkeheads than the wolf.
and ive seen wolves survive with bellies torn open or missing a tail but a channa would never survive anything like that.
which gives wolves the upper hand.
also,wolves tend to swallow things whole because they are ambush predators.
but if they were fighting and not eating,they can do MUCH more damage.