You could attempt something similar to do what Shunt did to Hypnodisc in series 4 of Robotwars: Fire an axe or arm with a steel rod into a bar/disc. The disc would grab the bar and pull it round until the bar jammed it against its own body. Then you just retract the arm as all that will have happened is the bar will have stopped the weapon almost instantly, probably bending the bar and probably the spinners chassis as well.
However there are like 10+ reasons why no one tries that, least of all because its a 1 in a million shot and you would need an arm travelling several times faster than the weapon itself to get the bar in.