So like, how could you have known for 100% certain that your teammate was solo? And if you thought you could hold it to the line (and you did!) why would you slow down even if a teammate was bridging solo?
The flip side is, let's say you slowed down to let your teammate catch up, the field sees this and it injects pace into their legs. And then you got caught. What sort of complaints would you be hearing then?
You worked with the info you had and you kicked ass. Congrats on the win!