The idea is the following: If someone is sneaking and you failed to spot them, if said person decides to attack you (they don't know if you have spotted them or not) they get a surprise round.
A surprise round gives the attacker one single extra round or attack at the beginning of the battle and maybe a penalty to defense for that round to the person who is caught surprised.
So the idea basically is that if you are caught surprised and the attacker gets the upper hand on you.
SPLATJOB
