Wombo combo takes time to regenerate abilities between uses. Shoulder charge is used all you want as Long as you sprint.
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It also has a cool down and can get screwed by sprint lock,also shoulder charge like I said you can't shoot you are literally running into someone majority of the time shoulder charge isn't that hard to dodge or gun them down where as wombo is near impossible.Yes wombo uses abilities but that doesn't change the fact it's a 99% of the time a guaranteed kill.
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Actually it only lasts 8 seconds (12 with stand asides but why would you use those?!)
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8 seconds is a long time to find a target and charge them in these small maps.