Leareth is perhaps a couple of miles ahead of him at this point, riding up the local minor road that runs alongside a river. There's a bridge ahead, which he needs to cross to reach the larger road that heads in the direction of Qorthes, the capital of Baires.
He's kind of daydreaming as he turns, paying just enough attention to be sure that there aren't any minds within a mile of him or any offensive magic. He can sense some sort of magic in the vicinity of the bridge, but practically everything is magical in Baires, they're swarming with mages, they must have the highest per capita rate of mage-gift outside the Tayledras. Half their buildings are maintained with magic in some shape or form.
Leareth turns his horse onto the bridge–
–and a damaged maintenance-spell on the stone fails, and fails in such a way that there's an energy-backlash with ripples out and destabilizes one of the other structural spells - and if Leareth were paying attention he could have caught it in time, but his mind is half-occupied wondering when Levris' circuit-route would take him near a border and if they might run into each other again...
The bridge collapses in a groaning screech of stone-on-stone and Leareth goes down in the middle of it, along with his poor horse - his shield-talisman isn't really specced against several hundred pounds of stone trying to crush him, the spell valiantly holds off most of it before crumpling, and he's kind of stunned as he hits the water.
- he flails for the surface, gets half a breath, starts trying to reinforce his personal shields, and then slams into the rapids that are right downstream of the bridge. There are several very painful collisions with rocks, and then one of them strikes his head, and there goes any chance of doing more magic right now. Leareth clings to consciousness for a few seconds longer, trying to get out a Mindspeech call for help - for some reason he's instinctively reaching for Levris in particular - and then everything goes vague and shapeless before fading to black.