Beast Tamers are the masters of the Asterian Beasts. They are primarily Throne Demons who ride atop the heads of these behemoths, guiding their movements and attacks. Dante must kill them in order to be able to master the beasts. After enough damage is dealt, the player can start a quick-time event in which Dante mounts the beast and slices the Beast Tamer in half.
There was no applicable strategy to this enemy because the player never actually fought the Tamers, but rather fought the Beasts that they rode. Thus, the strategy would be the same as fighting the Asterian Beast. However, sometimes these demons could pop up and try to uproot Dante from his mount, forcing him to go on foot and dispatch the new tamer. When this happened, rapidly pressing the circle/B button would prevent the player from being thrown down.