Bug with Hecarim's Devastating Charge and Veigar's Event Horizon.
When a champion dashing hits the wall of Event Horizon they are instantly stopped in place.
If Hecarim gets in range during Devastating Charge and begin's his leap/dash he will stop at the wall, but the dash will continue to through.
Basically Hecarim stops and half a second later Veigar is knocked back, takes damage, and has any on hits Hecarim has applied to him (red buff at the time).
It was weird being in the middle of Event Horizon, seeing Hecarim stopped, and still ended up being CCed.