Mark 2:12

‘And he arose, and immediately took up the mattress and went out in front of them all, with the result that they were all amazed and glorified God saying, “We have never seen anything like this”.'

This was Jesus' vindication. The man was immediately healed in front of everyone and demonstrated it by picking up his mattress and going out in full sight of all who were there. To the unprejudiced mind this could only prove that Jesus was clearly a true ‘man of God'. And that was how the crowds saw it, for they were amazed and gave glory to God. The words of Jesus had passed most of them by but the miracle was something to talk about, and to give praise about. They were not  just  spectacle seekers. And they had seen something beyond anything they had previously witnessed. But the Rabbis undoubtedly went out feeling very grim and unhappy. They should have been glorifying God (they could accuse others of not doing so - John 9:24) but they were too taken up with their theological aversion to what Jesus had said to do so. They just would not see the truth.