highest point in your jump, transform into the morph ball, while still holding the hot point on him. That's the weak point you're going after. Shoot at it weak point the thermal visor blanks out, switch to combat visor and now Thardus's weak point will be a dull bluish color. Attack it the same way as then, attack the weak point again, then evade the roll attack and start again. and regenerate Thardus. At that point just wait because he cannot take any