Kamen Rider 14

The Den-Liner arrives back in time and Den-O Sword form appears on the Den-Bird ("Arriving... with the bike!" he shouts) and he attacks the seemingly-confused Spider Imagin, who is quickly destroyed with what I think is yet another new version of the Extreme Slash, but I've honestly lost track at this point. Basically Den-O does the "flying sword" bit then finishes it off by running into the monster, reattaching the blade, and slashing him again. Anyway, the rehashed monster blows up and Den-O reverts to Ryôtarô and Momotaros.