Use it opportunistically. Use it to capitalize on damage for certain attacks (Trinity Smash + Demon Dodge + DT = massive damage) It can also be used to continue your combos. Think about it as it launches your enemies up if one is already airborne it will allow you to keep it suspended allowing you to follow it up with an attack from the ground such as a roulette. It can also be used to temporarily void the immunities enemies have against certain weapons. So for instance when against the Heaven Knight and the Hell Knight in the demo use it to quickly take out the Heaven Knight as heavier enemies are much easier to down with the Arbiter which works against the Hell Knight anyways.
An emergency bid for health and or offensive potential as always as well of course. --- In my restless dreams I see that town...
It can also be used to continue your combos. Think about it as it launches your enemies up if one is already airborne it will allow you to keep it suspended allowing you to follow it up with an attack from the ground such as a roulette.
The start up animation and the enemy floating without feeling your hits really breaks the flow, though. So far the only creative way to use it was in one video where the player landed on a platform during a mid-air combo and used the DT to wail on him with normal ground combo strings.
Conceptually this DT is really bad, the normal Quicksilver would have been better.
Devil Trigger while jumping, then you will be able to reach the enemies you lifted faster.
Devil Trigger only knocks and floats enemies into the air once, from what I've seen. --- There is no such thing as a "Quick Time Event done right". A game that has Quick Time Events is a "video game done wrong".