These are the jumpy Dragoons, not the horseback shooters from real history. They're specialized Knights and excel in battle. Dragoons are an icon, something that little kids aspire to be one day, and they've branded themselves to the point where they are the subject of many everyday expressions in RPGverse. Aim high like a Dragoon.
Nobody goes into a fight with a Dragoon and expects to have a fun time - they're absolute beasts. They wield massive spears scarily well, have huge dragon-esque armor and can casually leap into the sky at a moment's notice. Getting caught in the resulting impact is almost guaranteed to kill someone, if not maim and disfigure permanently. Dragoons aren't very common because they require a lot of time,effort and mastery to use their skills effectively, but the ones that exist know what they're doing and know where to aim.
Surprisingly, being able to jump really high isn't actually that helpful in everyday life. If the shockwave from landing was a little more subtle they'd be ideal for breaking into fortified areas, but unfortunately for them the telltale "thump" and earth-cracking gives them away pretty quickly. They are crazy strong and tough though, so they'll give any other Warrior a run for their money in jar-opening or a jog around the farm.