Gilga Yam and Beo has a property of certain chargeable moves where the damage becomes roughly twice as powerful and some attacks recieve additional effects. This is preferable method of killing enemies just for the sake of damage.
General Notes
Vergil utilizes this the most with Judgement Cut Beo is rarely used due to his Concentration mechanic where it grants all chargeable attacks an extra charge level for more damage.
One of the main reasons why Dante needs Gilga. Mastering it shaves his section over 2 minutes.
To identify whether Just Frame Attack is achieved or not, get the feel of the sound cue.
Beo and Gilga damage can be further increased by Distortion