to be fair the mechanics of drawing a trad bow vs a compound are the same. Sure the power, letoff etc make a compound much, much easier. But you're still drawing. The crossbow doesn't require the same mechanics. It's cocked and ready to go with potentially little to no movement if you're shooting off a rest.
This is my new favorite example of how having to draw your bow (compound or not) creates a challenge that the crossbow does not. And yes, he wouldn't have been able to hold it at all if it was trad, but with a crossbow that buck is dead