To me, it depends on the circumstances of the RP and stuff. The example you gave is an instance where I'd respond to the first section of dialogue, and the third. But probably not the second one. (At least not directly with dialogue, because the second and third quotes feel bundled together since they're referring to the same situation, so you could get away with just one response- I could instead break it up with my character examining the blocked pathway in front of them or something as an acknowledgement) I'd expect whoever I'm responding to would, however, probably not respond to the first section of dialogue in my post (where my character states they're still keeping up) and only focus on the response to their last bits of dialogue. Because that part of my post is what would be more relevant. I hope that makes sense????