Answer:
halo effect
Explanation:
Halo effect is defined as a cognitive bias that involves creation of an impression about an individual and this influences how we think and feel about their character. For example when a consumer has had previous poelsitive experience with a producer's good, they tend to create a good impression of the producer. Any new good introduced will be favourably received.
In this instance Brian tripped in front of the prospect and it took up to 5 minutes for him to organise himself. He has created a negative bimpression in the mind of the prospect. This leads to the feeling that Brian is clumsy and ineffectual.