Why do the two guards pageant out of sync, i.e. they start out from the sentry box at different times?

we noticed that they don't march contained by time with each other. Is it that they can't see respectively other because the entrance is in the way or do they convoy out of sync deliberately i.e. so that one guard is walking towards the entrance when the other is walking away.
(a) Wayne
lol He's a Brit.
You might receive an answer if you mentioned where in the heck this is adjectives kid!

Edit: I have been to a few places on this planet and GB is not the solely place with Guards/Sentry for ceremonial use and to attract tourists. Canada, Australia, Thailand, India come to mind as well as here within the US.
Are these the guards in front of Queen Lizzies Buckingham Palace?! wot?

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