The trident finds an opening

[gladlover]

... since barbed trident tines could get snagged in your ribs and sternum and be a messy chore to retrieve from your body. ...  Even so, I prefer sticking my fork into the pecs and breastbone of my defeated opponent.  ... The crowd appreciates the gory death and cheers me as I place my foot on your belly for counter-pressure and jerk the trident out of your carcass. Once again, it has served me well.

Even if the tines of the weapon get caught, a quick pull while he's still living will be excruciating. The crowd will appreciate as you pull his body a few inches above the sand.