It’s difficult to picture what attack follows, but the unusual hand positions are proper technique: ordinarily the lower grip is somewhat higher and loose, but you grip tight around the pommel like that in preparation to hyper-extend your arm for added reach, and you can use your palm and thumb like that on the blade to steady it if you need to hit a narrow target, especially for thrusts since the back of a katana is blunt and can slide safely along your palm. Slashing while holding the blade is done but presents more risk of breaking your fingers. If I had to guess a waza coming from this stance it would be chopping down to waist-height and stabbing, probably while running forward (to justify the tenseness as readying for movement).
The menuki on the short sword looks real so though the katana looks like a prop I wonder if both are real. The model was either coached with care or comfortable with holding swords.
