ASA Rules non-changes - obstruction

[kellerumps]

Consider this play.....Ground ball hit to 3rd base....They field it cleanly and their throw is up the line....First base leaves the bag to catch the ball and a collision occurs between 1stbase and BR.

Are you telling me that in this mess, if 1st base does not have the ball, then we are to rule obstruction??

Sounds like a major can of worms can be opened up here!!

Please advise.