You make the call

[BCCanuck]

Mick - Softball Canada uses the ISF wording for obstruction.This is from their casebook: (ignore the superfluous use of the word deliberately)

292. There is a runner at 2nd when the batter hits a pitched ball for a single to center field. R2 is deliberately obstructed and unable to touch 3rd and continues on to home plate where he scores. After all play has stopped the defence makes a dead ball appeal on R2 for missing 3rd.
RULING: The umpires shall award R2 both 3rd and home due to the deliberate obstruction. R2 is not required to touch 3rd base due to the obstruction. If a runner can not touch a base because s/he was obstructed s/he cannot be called out on a subsequent appeal.

Note :Softball Canada refers to runners according to the base on which they started.