Yeah, that's true alot of people have been talking about real madrid making a coming back. Though I think they did that to juventus some seasons ago I guess, but that does not give any guarantee that they will do the same to arsenal. Honestly I don't even see any possibility in that, because looking at arsenal performance in the first leg I think arsenal is ready to competite for the champions league title. I think the bookmakers is also thinking that real madrid can make a comeback which is why they gave them lesser odd while arsenal was given a higher odd, but the truth is that odd does not matters most time.
Maybe Real Madrid will just be favorites to win the second leg. But I think most of us also think Real Madrid is very unlikely to qualify for the next stage with 3 goals down in the first leg. But if it turns out that Real Madrid is really able to catch up and succeed in qualifying for the next stage then that will be very hot news in the world of football. Because that would really be a dramatic story that Real Madrid managed to recreate, which they do quite often. But if I'm honest, I personally doubt this. Arsenal does look more ready to go further in the UCL this time. I can't deny that. Because since the early stages of the UCL, we have seen that Arsenal is more solid than Real Madrid this season. So it is not surprising that Arsenal will successfully qualify for the next stage.