How do you use the Succubus soul on Castlevania Dawn of Sorrow

Properly use the Succubus soul?
Not just to walk through walls (succubus glitch)?
Once you have gained the Succubus soul, equip in your Bullet-type soul slot. Depending on your controls, press up and attack.
Soma moves forward, outlined in red. Do this in front of an enemy and not only does it damage the enemy, but restores some of Soma's health!