I fought once against Semp.
I was in a 110c, had a fun little turnfight against SF and an f4u i cant remember his name.
Semp jumped in and played the "attempt-extend" game.
A bit too many from this type of players theese days... on both sides.
As for DragonH5 and Agent: they are pretty good, respectable players, but no invincible gods. In my experience Dragon will turn with you in anything vs anything so idk how you couldnt shoot him down...