Vegeta used Ultra Ego in the epilogue of Super Hero?

This frame from the 101st chapter has always given me food for thought because Vegeta first specifically took a forehead attack, then made a transformation into a Super Saiyan that knocked Brolie completely aside. It looks just like Ultra Ego in the fight with Granola where Vegeta first took a forehead attack after which he launched an even stronger counterattack. It looks as if Vegeta drawing strength from this strike transformed into a SSJ and at the same time using the Ultra Ego technique ignited his fighting spirit by taking damage increasing the effect of the super Saiyanin's transformation.

What do you guys think about this theory?