Ha! read this: (2003)
In addition to talking about Ansar al-Islam, Powell is likely to focus on the presence of known members of Al-Qaeda in Baghdad-controlled areas of Iraq. One key figure is Jordanian Abu Musab Zarqawi, allegedly bin Laden's chief of chemical weapons, who received treatment in Iraq for wounds he suffered in Afghanistan. He is said to have had a leg amputated in a Baghdad hospital.
http://www.rferl.org/features/2003/0...2003155815.asp
This confirms the other reports that Zarqawi had lost a leg and was using an artificial leg that limited his mobility. Given that none of the hooded men in the beheading video show any signs of impairment, this strongly suggests that the video was made by other persons but blamed on Zarqawi.