If an opportunity arises where an Indian agent is arrested in their country, Pakistan would make every effort to milk the situation and create an international hue and cry.
The expanding Shia-Sunni conflict in the Muslim world is exposing vast gaps in popular understanding of the schism. For example when Zaine El Abedine Ben Ali, the Tunisian strongman was ousted, people thought a Shia dictator had fallen. From this they extrapolated that the Arab Spring was an anti-Shia plot.
The present hostage crisis, therefore should be accordingly dealt with. One cannot intervene in a sovereign state without invitation, as it has long-term consequences, specially in context of West Asia where long term energy imperatives are involved. Nevertheless, a mix of diplomacy backed by demonstration of military muscle (not intervention) can achieve the desired results. What good is INS Vikrmaditya for, if it cannot support Indian diplomacy at this critical period and that too in the region.