Sorry for the beginners question … but i cant seem to find the correct syntax to call a detail paremeter within a BLAST node .. 

Im trying to blast out the furthest point that is furthest away from all other points in a primitive.. promoting the highest value to detail (with maximum promotion method)  and then pluging this node into a spare input in the blast node and calling it with -1 ( see pic below) 

Im sure that there are other ways of doing this ..but I got fixated on trying to remember the correct syntax for this 

If just type in detail(=1,“FAREST”,0)  into the blast node i get the correct number .. so that part is set up correct .. I cant for the life of mew remember the correct syntax to input though .. 

Im sure ive done  this kind of operation multiple times before , but cant find the correct syntax anywhere on the internet.

you need to enclose expressions in backticks
also if you are using float numbersyou should qive it some threshold as equivalency of floats can be tricky

Is the blast set to run on points?