Kejriwal added in his message that no bar could keep him inside, and he would soon return. He probably imagines he is a Lord Krishna, who after his birth was miraculously taken out of the jail of his mama Kansa. Or perhaps he believes that the jail walls will be stormed and he will be rescued by a huge crowd, like the revolutionaries who stormed the Bastille in Paris on 14th July 1789.
None of that will happen. Kejriwal seems to be in for the long haul