It was only lap 3 of a GP - he had passed-by his pits twice before to see the same thing on his board: -0 PED and +0 LOR. He knew it was Jorge, his team-mate, behind - not Stoner, Dovi or Cal.
Lorenzo is fighting for the championship. He isn't going to (and didn't) make a rash pass on a team-mate - not when they're both right behind the race leader, and going away at the front.
Easy to say again with hindsight. If Spies had stayed behind Pedrosa for 5 or 6 laps do you really think Lorenzo wouldn't have tried a pass. He had Stoner somewhere behind and he wouldn't want him coming past. At the time Spies made his move they weren't pulling away as about 1s covered the top 5 for the first few laps.
In Spies position he knows he's faster than Pedrosa so he did what he thought he should, it didn't work and he admitted he made a mistake. Imagine if he'd sat behind him for 6 or 7 laps and then got passed by both Lorenzo and Stoner (argument's sake) Imagine all the bitching about Spies can't overtake - he should have gone past Pedrosa etc etc.
Don't disregard the fact that Lorenzo himself ran wide chasing Pedrosa around 8th lap but was more fortunate than Spies with the outcome. It was the same mistake though, what's the difference? Stoner also ran wide early on which let Crutchlow thorugh.
So tell us Bulto, what kind of expression was Jarvis wearing when Spies stupidly threw his career away?
Same expression all team managers have when they see their rider crash.