Well, after the guy did the running thing, he came closer and feignted until he felt ready to try to shoot in. That was trickier. I don't generally jump into an opponent as much as my instructors like. I can usually read a bait or taunt. Just wait for the contact. Honestly, the body follows the head, so I tend to prefer to simply push the head down to the floor and sprawl. That way I can still feel where their energy's going and I'm not fully committed in movement. It tends to slow them down too.
As for the Judo influences in BJJ, I haven't seen much in the ring. But I think each fighter picks the techniques they like the best or are the most comfortable with and reuses them when fighting. But to execute a good judo throw in the ring would require a couple of years training in judo. That's kinda what I mean. If these guys devoted a year in each art or more, you'd see a different calibur of fighters.
It wasn't until after two years training WC that I even found out that there were joint locks in the art. And throws, granted their mainly head and neck throws, but nevertheless.
If you stay in most arts long enough, they tend to cover more than appears. And WC is very subtle and decietful. Most people understand the speed, chain punching, and hand trapping (if they ever heard of the art before) for which WC is most known for. But very few realize that it's one of the few arts that cover as many situations for self defense. As an empty hand art, I feel it covers all areas of combat.
Like I said, I was very proud of my Ju-jitsu ground technique, but upon even just seeing the anti-grappling for the first time, I was and am still eager to learn more WC ground technique. It just works so well, and still allows me to keep my personal space on the ground. Believe it or not, being a smaller person does NOT give you more advantage over a large opponent on the ground. Better hit the weights! lol!
Especially if they know what you know.
example: I'm 125lbs, and my hubbie/teacher is 250lbs, and when he puts his ENTIRE body weight say on my stomach or chest like in a mount, it's hell and high water before I can roll him off me. And if he simply lays down on top, in say a front choke, ack! Yet the more I keep his full weight off my body the more manuverability I have on the ground. LOL! He can smother me with his chest he's so much larger than I!
So basically, the more I can avoid that point of combat, the better for my ribs! And the sooner I get back up the better, especially if it's before he does, and I can get in a few punches, knee, kick, forearm shiver in while I'm getting up too.
The idea is to keep them down while you keep your feet. Even when I took ju-jitsu we hardly ever went to the ground with the opponent after a throw, or sweep. To the knees was the most desireable, your knees in their neck and/or ribs while flexing a joint lock or choke. (But we trained straight for the break and not the submission as well.)