obstruction??

[legend]

I had a play in a little league game that I'm not sure I got right. Here's what happened. Runners on 1st & 2nd less then 2 outs. Batter hits a left center gap shot and while attempting to get to 3rd, the throw from the outfield got away from the 3rd baseman. The batter attempts to go home on the overthrow. The catcher (backing up the throw to 3rd) fields the overthrow and turns to run towards the plate. When he turns (to attempt to get back to the plate) he runs into one of the baserunners who had scored on the play and was walking towards the dugout. The distance between where the catcher fielded the ball and the plate was less then 15 feet. I believe it would have been a close play at the plate. Is this obstruction?