In your example u have an intermediate illegal state 0101 of four bits. Let us take your MSB (left most bit) out of these four bits. Due to metastability it is getting an illegal intermediate vaue of zero rather than legal value of high. So this is also problemful for one bit. I want to say this only in my last reply. Do u understand now? Comment on this.
let's say u are in a railway of a train that by accident you just passed the train gate and it closes and now you have to decide what to do go forward or backward u might hang on there for a while thinking