​Tactical Prowess is strong after buff, however we don’t have a way to tell whether an enemy is below 33% health. If we have to guess, this perk becomes very unpredictable and impractical. We need an indicator, like enemy glowing yellow when below 33% health, only show it to vanguard.

Also the existence of minimum hook distance makes melee then hook to execute impractical. The ideal matched game play style without relying teammates is shooting from range, bring enemy health below 33% then hook. However vanguard’s range damage or ammo count doesn’t support this game play, it runs dry quickly. 

I really like the look of this perk, but I agree. It has no use to me if I can't tell when the enemies health is low enough, all I need is some sort of mark I can see when their health is low enough. If that change is made I'll do a complete change to my build but without it it's too uncertain.