I am a bit confused about the depth limits with an OW certification. It seems to me that ultimately it is up to you to decide how far you can go without compromising safety. When I decided to go to that depth I did feel a bit of pressure from my buddy. Was he putting too much confidence in my ability to cope with such a depth? I wonder.
The depth limits with OW certification may vary from agency to agency; I don't know. For PADI, the recommended depth limit for brand new divers is 60 ft. The no-decompression limit for recreational divers is 130 ft. However, there are no "depth police," so a diver can go as deep as he/she is comfortable going. On the other hand, such recommendations tend to be based upon experience (both good and bad), and it is wise to abide by them as much as possible.
While diving is a learning process for the individual, it is also a learning process for buddy teams. Over time my wife and I have figured out how we work best. For example, we stay side-by-side. We swim close enough to touch each other easily. If we are against a wall, she is always on the inside. If we take a swim-through, she goes first. We have developed our own hand signals to supplement those taught in OW classes. We are very comfortable with each other now, but there were many "learning experiences," such as the one I mentioned above.
To expand on that story, the divemaster had set a depth limit of 90 ft. One couple who had just joined our group promptly dropped below that to 100 ft. We were relatively new divers, so we just followed them in order to "stay with the group." However, when I noticed my depth, I leveled off. My wife didn't, and I wasn't sure why.
My computer showed that I was approaching my nitrogen limit, and I was nervous about going deeper to retrieve her. I wasn't sure if she knew what she was doing. Maybe her nitrogen loading was fine. While I was worried about entering a deco situation, I did NOT think about the possibility that she might be narced. (It was the first time we had ever been this deep, and it wasn't intentional.)
Back then, we were not diving as close together, so I didn't know how to get her attention. Fortunately, a more experienced diver behind us recognized what was happening, grabbed my wife's arm and brought her up to a safer level.
In retrospect, I think I was also a bit affected because I was having a hard time thinking through the whole event as it was occurring, though the whole thing was probably only a minute or two.
The point is that I learn something on every dive. You can plan, but plans don't always go as you expect. You learn things on good dives, but you sometimes learn more on the bad ones. The more experience you get, the more you realize what kinds of things may happen. And the more you discuss those unexpected events with your dive partners, the more you all learn about how each other thinks and what each of you would do if it ever happens again.