If your the superspy...
Find an alley and camp if your low on health and don't want to risk dying. You still get credit for 3 missions if time runs out
If your a merc (pre superspy)...
Try and take the intels when they are bunched together, like someone has two... then you don't have a target on your back searching...
(post superspy)
Stay at a distance and snipe him, or run behind when he's planting and knife.