When we start scenarios, we will often exercise a wide variety of skills.  Take a foot entrapment on a wide portion of the river in fast rapids for example.  It may be very difficult to paddle a kayak out to the victim and hold them, you need an alternate plan.  Perhaps a stabilization line will help.  The trick is crossing over 100' of raging rapids in a timely manner.  Every situation is different and sometimes you need to be creative.