Shadows do 20% less, so if the shield doesn't cut down any damage, Rise's throw would do 750 damage normally. That's on the fairly low side - Yosuke and Akihiko's hover around there, but Yosuke's inflicts Poison and Aki can followup from his. Slabs also does about the same, so I guess it's not impossible.
I watched the video, and it definitely seems like Rise's throw inflicts Charm, which would explain the SP drop.