After some reading I realized that Splintering Weapon should cause the victim bleeding effect and forcing the player four seconds forced walking. The thing is that Forced Walk is supposed to make you unable to run, unless you are damaged.
As you can see on the gif, even using a trapbox to break the effect, the forced walking debuff continues.

www.uoguide.com
https://www.uoguide.com/Forced_Walk
I'm not sure about the 2 debuffs time effect, maybe I had a misunderstanding while reading about it but the forced walk should be 4 seconds not 9.
It would be nice if people gather more information from OSI and other sources, since I only have uoguide links...
As you can see on the gif, even using a trapbox to break the effect, the forced walking debuff continues.

Splintering Weapon - UOGuide, the Ultima Online Encyclopedia
https://www.uoguide.com/Forced_Walk
I'm not sure about the 2 debuffs time effect, maybe I had a misunderstanding while reading about it but the forced walk should be 4 seconds not 9.
It would be nice if people gather more information from OSI and other sources, since I only have uoguide links...