  The light cone OPE limit provides a significant amount of information
regarding the conformal field theory (CFT), like the high-low temperature limit
of the partition function. We started with the light cone bootstrap in the {\it
general} CFT ${}_2$ with $c>1$. For this purpose, we needed an explicit
asymptotic form of the Virasoro conformal blocks in the limit $z \to 1$, which
was unknown until now. In this study, we computed it in general by studying the
pole structure of the {\it fusion matrix} (or the crossing kernel). Applying
this result to the light cone bootstrap, we obtained the universal total twist
(or equivalently, the universal binding energy) of two particles at a large
angular momentum. In particular, we found that the total twist is saturated by
the value $\frac{c-1}{12}$ if the total Liouville momentum exceeds beyond the
{\it BTZ threshold}. This might be interpreted as a black hole formation in
AdS${}_3$. As another application of our light cone singularity, we studied the
dynamics of entanglement after a global quench and found a Renyi phase
transition as the replica number was varied. We also investigated the dynamics
of the 2nd Renyi entropy after a local quench. We also provide a universal form
of the Regge limit of the Virasoro conformal blocks from the analysis of the
light cone singularity. This Regge limit is related to the general $n$-th Renyi
entropy after a local quench and out of time ordered correlators.
