1vs1 invasion is the most pointless and poorly designed pvp mode. The arenas are far to small, and it just becomes a race to who can call in their behemoths first. The 1 who gets it first will just win and then spawn trap their opponent. Ok sure, there are those arenas with side tunnels that you can spawn in and the entry ways are to short for a behemoth, so you could just wait out their timers. The only issue is that your opponent now has a score and has the tunnel covered. I am not saying that it is fully impossible to turn it around, but quite improbable. I have been on both sides of the coin and mostly it is a wrap if you die. Not to mention how because the maps are so small, the enemy could just spawn trap you. Spawned in once before and had a stasis turret in my face, another time i got killed right away because the player was next to me as i spawned in.