When you’re under pressure to fill a gap, the reaction is to get the first person willing to comply. Get the job done, the position covered, do anything possible even at the expense of others. But to do that is to forget that you are working with people and not simply assets.
Even when there is a person able to meet your immediate need, be sure to count the cost. Is that person close to burn-out? Have they been serving needs more often than should be expected? Have they had a break? Sometimes the decision to drop the ball rather than strain a valuable volunteer or employee is a difficult but necessary one.