Images from the AIA 304 Å channel. All times in seconds are given as times after 09:00 UT on 20 January 2011. a) A small-scale loop or arcade brightening at the base of the solar jet. b) The arrow shows the twisted magnetic field highlighted by bright plasma. c) The onset of helical motion in the plasmas curtain. The white arrow shows the position where the whip-like effect is seen. The green arrows point-out the two, bright elongated features either side of the jet at its footpoints. d) An image of the full jet close to its maximum height. The solid white line shows the position of the cross-cut in Fig. 2. The dotted line is the position of the cross-cut in Fig. 3. e) Shows the cross-cuts (black lines) placed along the bright elongated features at the footpoint of the jet in AIA 171 Å. The image also shows clearly the dark filament thought to be an ejected magnetic loop (or arcade).