Example combo Stryker vs Ermac:
HK, HP, HP, LP, riot gun, baton dash(whiff), aaLP, aaLP, riot gun.
This means you run cancel between the punches by tapping run after the first enabling him to keep walking forward and be close enough to hit the second, but at the same time it adds just enough total combo time to surpass the small usage time limit between the riot guns.
Example of run burst and run cancel Sindel vs Ermac:
HK, HP, HP, D+HP, Run Burst, aaHP, aaHP, JK, AFB.
This means you take a couple walking steps to allow your run bar/combo meter to refill and you use the sliver of green to get that little dashing step to get you close enough to connect the first HP very close and high, and then after that HP cancel it with the run button tap, allowing for another aaHP (run cancel) ensuring contact of the JK AFB.