IIRC, he worked for Pence. Not a lot of laughs over at Pence’s office. Pence probably thought laughing was sacrilegious unless done with your wife.
I think it was understood that with Pence, he was ok with the Impeachments, and the Democrats knew he would be weak if he took over from Trump.
That is not the case with Vance, which is why I believe they will not try any impeachment shenanigans with Trump this time.