Easy answer: There is no surprise round.
PCs were hiding out in an enclosed area in the forest for a few days. They set traps. The enemy NPCs close in, and one of them gets his foot ensnared, which lifts him upside down. The NPCs are a little smart, so instead of helping their dangling friend, they run for cover. I ask for initiative.
Player says "I want to make a stealth check, and then I want a surprise round".
Me: "No. This ain't 3.5. The rules don't have any sort of surprise round. Combat starts as soon as anybody needs to turn into a combatant. The very moment they see their buddy ensnared, imagine as if the NPCs asked me "Can we roll for initiative to run away?" and then I say "yes" to them."
Player: "That's BS. We should get a surprise round".
Me: "I might consider it if you guys were somehow continuously all aiming your weapons at the same trap for the past three days, and ready an action to shoot the next NPC that wasn't ensnared. Consider that the snare IS the surprise round, and the surprise round is finished. You can do additional things to catch them off guard, like having a silent alarm where only the PCs are alerted, but instead of granting you a surprise round, it would grant you boost dice to your cool check"
Player: "BS! We should get a surprise round!"
Me: "Okay, we're not argue about it, so I'm going to use my power as the gm (it was a heated debate), and declare that I'm right, but I will consult the overlords on the FFG forums to see how they feel about it."
How do you guys feel about this?