This article is from the Hanggliding and Paragliding FAQ, by Joao Geada with numerous contributions by others.
A paraglider may lockout if not flown directly behind the
towline. Under tow the pilot will be less aware of canopy alignment
and must be sure to keep it straight. The pilot should hold little or
no brakes except for directional control unless tow tension is very
light. Pilot must be able to manage a surge properly if releasing
while tow tension is still being applied.