This past motzei Shabbos, in the Shul where I davened, there were a number of young men who were lining up to be included in the communal havdallah done at the end of Maariv. The person making havdallah made the beracha on the besamim and then passed the besamim around for the assembled to smell it. However, before it had made it all the way around, he continued on to the beracha on the candle light, to which they needed to respond amen and to use the light. Some of them, as far as I could tell, had not yet gotten the besamim by the time havdallah was over.
Did those who did not smell the besamim before answering amen to other berachos, and holding their hands up to the candle light, make an interruption which invalidated their inclusion in the beracha on the besamim? If this does work, why is it not an interruption?