This may be another one of those things that, like grabbing the seat in front of you, if you don’t fly often you don’t think about it. But after almost every flight I’ve taken over the last few weeks, someone has stopped abruptly, right in front of me, in the middle of the jetbridge (or the space right outside of it). Maybe people are trying so hard to get off the plane that they don’t arrange their belongings in a comfortable way, and they need to stop and fix them? Or they want to get their phone/keys/wallet/etc. out of their bag? Regardless of the reason, it can cause a logjam, or even someone to run into you. I came this close to running into someone who stopped right in the middle of the path outside the jetbridge on Saturday.
This is true for the airport in general, and really any place where there is a hallway or walkway used by lots of people at a time. If you need to stop, glance around you and then move to the side without running into anyone. I actually treat it like driving–I look to my blind spot, then get out of the way. Sometimes there are extenuating circumstances, but please, move over to the side if you have to stop.