I've read/heard on the recent news that on an ongoing case, lawyer of a person, himself, has lawyered up (actually, I heard that about the Trump's lawyer, here, or here but please don't derail the question with the particular case).
As this is the first time I am hearing something like that and considering I don't have much experience with law, I want to know, why and on which cases such thing happens? Is it because if a lawyer loses to defend his/her client, he/she should pay some tribute to his constituent or something like that, or lawyers of a lawyer have just advising role in general?