Sam is out on his bike right now and he will be giving an effort based on his knowledge of himself played against how long his ride is supposed to be - in this case about 25 kms. You can go a lot harder for 25 k than you can for 50.

So he goes balls out for 25 kms. But at the end of the 25 kms there is no relief. Why? Because the relief, me, is on a bed in the back of an RV that is lost.

So now Sam must make a choice. Back right off his effort and find a good sustainable tempo that he can maintain until we find one another...

Or

...Keep at 'er and hope for the best. Problem is not now, however, it's later. A longer sustained higher effort is difficult to recover from meaning, that with 40 some odd hours of racing left, poorer performance later becomes the thorn in your side.