Again, this sequence is from the SCI-FI channel's A Passage to Middle-Earth, a TV special included in the FotR theatrical version DVD Extras. If you really are dying to see it and/or cap it for yourself, it occurs at just past 10 minutes into that special.
The caps below are from the tail end of the dance sequence that is featured in the Extras. The camera has been following Frodo through the lines of the dance. The dancing in this sequence differs from the part that made it into the film, in which Frodo is dancing with a specific partner. Here, he is part of a group.
When Frodo gets to the end of a series of hand-offs, he bursts out of line (and, perhaps, out of character). It may be part of the blocking for the scene, but I am inclined to agree with Maeglian that someone has probably just yelled, "cut"! In any event, what happens is that film Frodo throws himself upon Sam while Rosie (Sara McLeod) looks on....
Click HERE for table of Frodo and Elijah Wood Screencaps.