A very common counter to the Drop Seio Nage is for the person to sprawl out to your side to take away the power of the throw and to potentially even take your back.
Here is a way to finish the throw when they do this.

In my opinion, being able to takedown from various clinches should be the core of your takedown arsenal, at least in the beginning of your training.
I’m a big fan of knee block takedowns because they don’t require a lot of power and if they fail it is still possible to work into other clinch takedowns.
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I believe that being able to takedown from the Clinch Positions is crucial to Gracie Jiu-Jitsu.

In general, I teach most of my throws with a focus on my staying standing.

But, in some cases it may be more feasible or easier to go to the ground with my opponent.

When that is the case, these are two of my favorite throws since they can be down from very close range limiting the potential for the opponent to strike you well.

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