judo in general doesn't work for people who can't resist punches to the face. if you wanna try to throw a guy with judo techniques, you gotta be ready to get punched to your face before throwing him down. this video is the best example:
the fight starts at 1:55, and the judo guy failed to do O Soto Gari at 2:07. in fact, the judo guy was trying to throw him, but unfortunatly he couldn't because he was eating punches. Guess what!the fat guy saved him! in my opinion, wrestling(double/single leg) is more useful than judo throws in SF. if the guy grabs you, then quickly fall and pull your guard and start playing BJJ. Or, you can train boxing which will help you to absorb punches and be able dodge punches and etc...and that's my advice bro!
That was a very bad idea. You only go to osoto gari, especially in a MMA fight (street fight in the case) if you got an hold in the guy and if you can push him back, which was not the case. If he wanted to use a throw he should have clinch first with double over/under hooks or a double under. That would stop the strikes.
After that the options are simple, just watch a Jon Jones/Fedor fight, they to the exact same thing. You can push him back and you are in front of him? Ouchi gari in the face. You can push him back and you are slightly in the outside? Tani otoshi/Ko soto gake (outside leg trip).
You are holding him and he is pushing you back? Sasae tsurikomi in the face. See how Jon Jones was dropping Gusmao and Bonnar left and right, because they let JBJ get a tight hold on them and decided to push him foward with all their strenght. And even against Rashad, the only takedown that was effective was Sasae, a throw that is very underated but extremely useful in MMA conditions, due to the constant clinch game. Just ask Fedor and JBJ, 2 guys who based a big part of their feared clinch game around it.
However, an important notion: you should use a throw/takedown that you KNOW how to use and used before. This guy didn't know sh*t about how to throw anything, especially under "fire conditions", so he should avoid it anyway.
PS: if you check JBJ vs Rampage, it's funny to notice all this sequence I just described in the takedown that gave JBJ's the RNC that ended the fight. After the clinch, JBJ starts pushing Rampage back. Seeing that he is overpowering him, something he couldn't do in the earlier rounds (in fact at some point in the earlier rounds he tried the exact same sequence, but unable to pushing him forward, he tried a Sasae, almost putting him on the ground, not doing it because Rampage was not really pushing him back, just countering JBJ's attempts) JBJ tries a ouchi gari that is stopped by Rampage with his right hand.
Next he tries a outside leg trip (ko soto gake) which Rampage anticipates and backs down. In the end, and already against the cage, JBJ changes his left arm's position and threats Rampage's neck with a guillotine. Now having to defend his neck, and not having his right arm to stop JBJ from closing the necessary distance, he allows him to step forward, this time finishing the ouchi gari. Moments later he was RNC'ed.
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See 16m35s for the first sequence, with the sasae try, and see 33m10s for that final sequence I just described.