A quick question about inititative:
Situation:
1 enemy NPC stands in a street, he sees the PCs and they see him.
They start talking until he decides that its time for his friends to attack.
So there is
Regular ini count for the 1 enemy NPC and the PCs
1 surprise round (1standart action) for everyone else (hidden until now)
After the surprise round the previously hidden NPCs get a regular ini count and everything starts as usual.
Is that correct so far? Surprise rounds always confuse me, especially when the PCs start shouting something inbetween, what they want to immediatley do and so on. Its good that they get so into it, but then every NPC would be slower than them, as they cant shout inbetween. XD
How is it with reinforcments? I think I read somewhere that new troups always go to the top of the ini count.
Assuming the extra NPC bad-guys are hidden well, and the PC's don't know they are there and going to act, then the first bad guy attacking (or making himself a visible threat) is the triggering act. All the bad guys (who knew the ambush was coming) get a surprise round action.
The PC's (assuming none of them noticed any extra bad guys prior to being engaged) do not get to act in the surprise round. They do not act until Round 1, but this has caveats.
If any of the PC's had readied an action (say, to attack the conversing bad guy if the PC's were attacked in any way), then that would actually go off FIRST, before you resolve the actions of the bad-guy mooks.
If some of the PC's noticed the bad guy mooks as a threat before the mooks initiated combat, but some of the PC's did not, the ones that noticed also get to act in the surprise round. Those that didn't notice, don't act until Round 1.
In Red Hand of Doom, it always had reinforcements arrive at the end of a given round ("Six more hobgoblins arrive from the south end of the map at the end of round 4."), etc. (Which is effectively the same as them being at the top of the initiative count, but they spend their first action "arriving on the scene").