The man is not sinful as he is not obliged to wait for you, and your salah is valid.

sheikh, I came late to the congregation in the masjid and joined the congr. in the second row and missed a Raka’ or two. The guy who was praying in front of me (in the front row) stood and went away after the congr. finished while I was still making up my missed Raka’s. Please confim: (1) Is the guy sinful; major or minor? (2) Is my prayer valid? Do I have to repeat?

Prayer | October 1, 2017 12:50 am
Previous

Sheikh, If we reach the Salatul Jama’h, when Imam uters Salaam should we stand up and complete the missed Rukaat or we should wait for Imam to uter the second Salaam we stand up. Right now we are doing like this Is this is okay?
Next

I’m pregnant. I offer salah while sitting on chair. I offer Sajdah on a cushion placed on table. Purpose of cushion is 2 raise the height of table as I can’t bend more. Is it permissible to offer Sajdah on soft cushion ?