>mind my own business
>slaughtering the peasants and men-at-arms near the bridge
>realize its night
>suddenly BOSS BATTLE
>in the field
>NIGHT CALVARY
I literally almost had this dude on my first fight after killing the Pumpkin Head boss in the Waypoint Ruins but the camera goofed on me and I got stuck against some tree and brushes
You can temporarily "kill" his mount and wail on him a bit before he does an AoE vortex blast thing then remounts again, so you can target between the horse and the rider himself
Before this I was getting endlessly sodomized by the Crucible Knight in the Evergade or whatever its called
Tree Sentinel? That guy was more of a challenge on horseback than Margit was on feet.