The pressure to conform can be resisted if there are other people present who are not conforming.
For example in Asch's research , the confederate who is not conforming may not be giving the 'right' answer
Simply the fact that someone else is not following the majority is social support
It enables the naive pp to be free to follow their own conscience
The confederate acts as a 'model' of independent behaviour
Their dissent gives rise to more dissent because it shows that the majority is no longer unanimous