Horizon Forbidden West - Plasma Blast Trial

in this trial u have to use PLASMA AMMO on the ROLLERBACK to get it in the PLASMA BLAST STATE, once its in that state you have a LIMITED TIME to do as much DAMAGE as you can BUT you CAN'T KILL it
when using plasma ammo and get the target in PLASMA STATE, there will be a timer on the target, once the timer is done the target gets hit with additional damage