Wolves attack humans much less frequently than dogs do, so I would expect a ratio like that. I’m not sure how often bobcats attack humans, but anecdotally, it seems that mountain lions attack humans more than single wolves do. (And any single wolf that does attack a human doesn’t count because it’s just a …
lone wolf. YEAAAHHHHH!)
A 30 pound bobcat could do a lot of damage, but a reasonably fit adult human with modest fight in them could best the cat. You wouldn’t stand in front of it and try to punch it. You would grab some part of it, then use that as a handle and swing the cat into the ground. If the cat has a grip on some part of you, hit the ground using the cat as a cushion and it would probably be fatally injured at the first fall under a human many times its mass. Every bone in its body is far more fragile than every corresponding bone in yours.
Also note that while cats are very strong for their size, those cat muscles use a lot of O2, so they don’t have a lot of stamina. Reptiles are even worse off. I’ve yet to see a cat or alligator do well in a triathlon.
Ignorance fought! I now know how to take down an injured squirrel.
I could take down a monkey if I could fight him with a banana.
Just as he’s about to kill me with those powerful monkey arms, I’d say ‘Hey, want a banana?’ Then, while he’s distracted by the sweet, sweet banana I’d kill him. Because the damned thing was going to take my banana. No one takes my banana.
I see what you did there. 
The two-handed Kirk-ear-cup would only work against maybe a bear that has you in a death hug.
And I doubt a rhino or hippo is going to give you time to make a diamond cannon.
But that brings up the general point I was going to make. What animals can we defeat? How squeemish are you?? Are you fully prepared to dig your thumbs into their eye sockets and tear their noses apart with your teeth? Cause lots of mammals have very squishy noses.
So yeah, you’re putting yourself in mauling distance but that animal better make quick work of you cause he’s gonna be blind in a second.*
*Disclaimer:This technique may not work against elephants.
Similarly with one of Niven’s “Draco Tavern” stories. I believe the last line is “My evolution includes a club.”
The Star Trek version , even though supposedly adapted from Brown’s story*, completely changes the nature of the fight and how it was carried out. Read the story – there’s a reason it’s in the Science Fiction Hal of Fame. One day, I’d like to see someone do it justice in CGI without padding it.
No diamond cannon. No gunpowder, no dinosaur-like Gorn. But a wickedly clever problem to overcome if the champion was going to win.
And , as you can see from the story, you can’t just “pick up a rock and hit the other guy with it.”
*As has been frequently pointed out, it really wasn’t. Gene L. Coon reportedly wrote the script first, then people noticed the similarity, so they bought the rights from Brown. But the Star Trek story always WAS different.
Yeah, it’s hard to believe it hasn’t been properly filmed yet. The staging casting, and even action are very simple.
To resurrect this thread a bit. Yesterday, a jogger killed a mountain lion with their bare hands. It was a juvenile so only 80 pounds (although adult females will sometimes be that small) so it stays within my 100 lb. range.
I’m glad this was bumped because I think that pound for pound a juvenile Giant Tortoise might be even easier to defeat than a canid or weak herd animal. I’d think that ones between 1-200 pounds you could eventually inflict enough blunt damage on them to kill them by just kicking and punching and jumping on them. The larger ones, you might not be able to kill them before you die of thirst or hunger.