How did I undo someone else's commit?

[S Green]

I'm trying to understand how I could have undone someone else's commit, in order to avoid inadvertently doing it again.

• Someone else did a commit
• I did a pull, then push and commit
• The other person's commit is gone.

How could this happen?

The view shows that the other person  did not "merge branch to master", but I did "merge branch to master" with my commit.

Thanks

[Tim Crall]

Did the other person push their commit? Where is their commit missing from - their own repo, a central repo, your repo?

[Jobin Kuruvilla [Adaptavist]]

So, the other person didn't merge to master but you pulled from master? Or were you both working on different branches?