Sometimes the element of surprise is lost; when you can't afford to play around all nice and professional like.

Sometimes you have to put your foot down, rip up as big as chunk of ground as you can, and throw it at your troubles. If nothing else, you'd be surprised how much a problem solver a good stare down can serve you when you can muster up your meanest face. Then again, this is making all sorts of assumptions about whatever ol' Mac's doing, for all you know he could be helping you carry your rock across the street, or using the broad side of a mountain to shield a troupe of beachgoers from the pitiless sun; oooooor maybe he's demonstrating the proper etiquette for doing squats by the tons.

Against the more classic trope of anger infusing his strength, Mac doesn't really need a particular reason to draw further upon his more latent physical talents when the going calls for it; only a sufficient level of counterforce to heave against, and a good old fashioned dose of determination to get his point across. Just don't expect him to end up looking ANYTHING so merely feline by the time he's gone and gotten excited!

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Once again, all credit goes to  CarlsFAPage for this magnificent commission. Give him your eye, folks; he could really use the promotion. ^^