Chekov's Elk

So, the villain in this "Mark Trail" is an oil company lobbyist named, I kid you not, Johnny Walker. He shot an elk, wounded it, and wouldn't go after it. He's now running from Mark's justice, and is about to meet Mother Nature's brand!

And then there's this: A commenter at The Comics Curmudgeon noted:

…So Johnny Walker is about to be done in by Glenfiddich? Subtle, just like the rich, complex notes that only a truly great single-malt whisky can provide!