Predator + Trinity + Hecarim's E = You're absolutely fucking dead, with zero counterplay since he's zooming in at 500 mph.
My main complaint is that even using a spellshield doesn't stop it. Noct's and Sivir's spellshields do NOTHING against his E, except cancel the displace. You still take the full 2400 damage on a targeted ability that you can't even flash out of, like you can with Fizz's q. There is no skill required when playing Hecarim. You build one shot and right click the enemy adc. If they die, you win. If not, you lose. It's like old Fiora, but much less difficult needing far less items to pull off and way safer and reliable.