[RM2K3] How can i make an NPC go through an event(like elevators) here an example...

How can i make an NPC go through an event(like elevators) here an example...

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A man (enemy )
like a spy scene(we spy on that man)
he had put some explosive under a truck(if it is possible for rpgmaker2k3,tell me how?)
the man run through an elevator(this is the main question)
we also run to it(sprite of running)
well, IT'S AN EXAMPLE.....answer