Characters goes through walls/structures when fighting

[Mandioca]

Characters keep going through structures when fighting, any idea if this is fixable?

[NZL]

iv'e had this problem too many of my slaves i'm training off escape because of this the best way i fix it is 3x speed but soon as they get close to a wall or start standing inside one i 1x and manually move them back to the middle

[Sotanaht]

It's MUCH harder for them to go through defensive walls than regular structures (just consider how thick those walls are). I recommend building your prison/training area in a separately walled off compartment in your base. Personally I fight inside the building and whenever the enemy "escapes" into the walled courtyard I knock them out and put them back inside.

Also I've found that my other characters will immediately drop what they are doing and run to "assist" unless I lock everything behind a gate. They will actually unlock normal doors to get in and attack my prisoners unless gated off or set to passive.

[ChiefScorpion_117]

A couple of years late but here's the answer you're seeking: metal tables.
It is almost impossible for NPC to clip through metal tables (note that I said almost impossible because I suspect that it is still possible to happen) so just build an arena with metal tables and enjoy the sparring!