I like to imagine that either some of the Charon soldiers or Sharkface just walk in on them doing this and have no idea what to do so they just slowly walk back out.
Felix: "Ha gotcha ya" Locus: "A word of this and I kill yo-" Felix: "How about a dance (☞゚ヮ゚)☞???" Locus: "..." *Literally three seconds later Felix's body was found*
Mmd isn’t lengthy if it’s a set animation with set models. You basically plop a model into given motions as long as the joints match each rigged part of the preset animation. What IS lengthy is blenders and tweaking the camera