Local Rules or Customs

[rotationslim]

>new team A can inbounds in their BC without ref touching
>- but from the sideline only and can't migrate up the >sideline, they still must abide by the throw-in >restrictions

Explain above to me.. why is this done, with a running clock it wouldn't save time.. is it to lessen the ref's running around.. or is it to just never give the players a chance to get their breath?

Just looking to understand the theory behind it.