I don't understand why you want pass as NF. If there was no interference, 2♠ committed to at least 3♥. I don't see why things should change now. Given that pass is forcing, pass showing extras is better because i) When we are weak, opponents are more likely to buy the contract. Bidding 3♥ immediately gives them less room to work out their best strain/level. ii) When we have extras, we are more likely to buy the contract. Passing gives us space to work out our best level and perhaps strain too.