Anything that can kill in one hit can be considered op. Specially when the only reason why you can't spam it is because you just need a couple of seconds to pick up a running pace.
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I get the reference tbh c falcon air forward attack is closer. Sagat's tiger knee is like exact same animation though, check it out. Regardless of what you call it, it's pretty fair. If I get shoulder charged it's either my fault I wasn't paying attention or that Titan is good enough to avoid my fire, without using their weapon, get in my face and clobber me.