So today I played a match with an Omen who keep smoking entrance when we attack. And we just kept dying. was he just trolling ? or there is a good reason to smoke entrance we didn't knew ?

Either at the start of the game, or the start of each round, you get a random set of abilities. only 1 ability 1, 1 ability 2, and 1 ability 3, ofc otherwise it wouldn't really work. It wouldn't be awful if you could choose a setup but ther...