The Congress will try to get majority by roping in other parties that were totally opposed to the Congress. They may even try to break the NDA. But, this is fair as it is in "national interest". But, it is a different matter if the opposition indulges in such adventurism. Then it is anti-democratic norms!!!!!
If a similar situation was faced by a BJP Govt, then the very same Congress would announce that the Govt fell due to "the weight of its own internal contradictions".