Make an event thats trigger is set to 'Touched by Hero' and Event Layer to 'Below Hero', and place that event on the tile that you want to activate that running guy event (basically, when you step on this event the other guy will run by).
Next, under the 'Event Commands' find the 'Switch Operations' option (1st page, right side) and make it turn the Single Switch 0001 (You can also name it w/e you like) ON (under 'Operations').
Then, have another event set up from where you want the other guy to run. In that event, set the Event Layer to 'Same Layer as Hero'. Don't forget to set the other guy's graphic under the Event Graphic. Then, on the top, click the 'New Page' button. On the second page, set its trigger to 'Auto Start' (if you want to not be able to move while it happens), or 'Parallel Process' (you will be able to move at the same time the other guy is running past). Set its Event Layer to 'Same Layer as Hero'. In the top left corner, under the Preconditions, check the first 'Switch' option and select the switch 0001. In the Event Commands, select the 'Move Event' on the 2nd page bottom right column. Select the actions you want it to take (1 action per command). Make sure to set Event Name to 'This Event'. After which, put in a 'Proceed with Movement' in the Event Commands (found right under the 'Move Event'). As a final thing, put in the 'Switch Operations' with switch 0001 again, although this time at the bottom set it to OFF.
Thats pretty much all there is to it