i am a 1st yr analyst and a 2nd yr analyst will often trying and sneak in help on his staffings when i have a little downtime, almost always b***h work that keeps me there late. he says that he has a lot on so can't handle it all himself and talks about it being a good learning experience, but will often leave early while he leaves me to do his work. treats me and fellow 1st yr analysts as if we're interns. i understand that people may need help and that we're all there to work hard, but this is becoming a frequent occurrence and i know that this analyst is doing it behind the back of senior team members.
is this normal? how / should i push back?