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Originally posted by: Luke Skywalker
but wait a minute...
if all those guards saw him... why didnt they chase him too?
or at least announce they had an intruder??
But most of them didn't. If you watch the scene closely, only a few of the stormtroopers see Han. Not to mention the whole Death Star was on alert for them anyway between levels 5 and 6. Also, the corridor was only so big so it probably took the clones a little time to file out single file once they all realized what was going on.