This is no longer an issue but for future reference what is the best way to tell something a coworker did is not okay without making them feel intimidated?
For context, we were working on a project and there were some things that came up that were clearly not finished on their end. We were behind schedule and they mention that they are going to go home. I work in a pretty "chill" workplace but the expectation is we get our things done but I did not want to say "hey we still have a lot of work to do, you can't leave yet."
They ended up getting their work done the next day and luckily we still managed to get everything done on time but it definitely was not something I thought was okay. Is it better to talk to them personally about it or is it something I should go to the manager about? The only reason I am hesitant to go to my manager about it is that I feel it's important I am communicating with my coworker and not just running to my manager whenever something is wrong.
EDIT: Seems like there are lots of factors that matter. I apologize for not addressing them.
In terms of there not being a problem, yes it ended up working out and everything got done but this did end up making people in QA have to wait another day giving them less time to work which made them work over the weekend. You can consider that a problem if you want. The bigger issue was when we both came together to talk about what we had to turn in for QA and things were definitely missing and when asked why they were not done and said that they completely forgot.
I am not a supervisor over this person but, at least at the time, I was definitely "leading" the project on our end. By that I mean people were coming to me to see when things were done, I was doing the hand off, etc. It's hard for me to say I was their supervisor but I am a tad more senior in the team of only us two...
In terms of the "chill" environment, it's a startup so some people work 40 hours, some people work 50 hours, some people clock in late and leave early. It really doesn't matter as long as you get your stuff done.