You get a circular voltage gradient away from the strike spot. A human with their two legs doesn’t spread along that as far as a deer’s four legs do, so they catch more voltage drop across that, which also runs through their body (along their heart etc). It just depends a lot on how and where a body is affected by electricity.

cannot opener

I use an Open With extension in Firefox for that so it’s just an entry in the right click menu for me. Super convenient.