Flying with a group has many benefits, but at the same time can place undue stress on some of the participants, such as when the group decides to continue on ,where one individual may consider it unwise. This uneasy feeling on a person, already not feeling well, may cause that person to make poor judgements, in relation to the decisions pilots have to make ,particularly when flying in less than ideal conditions . If you do not feel 100% then best stay on the ground .... Bob