Just look at the chart below - if you were wondering why did Nifty open lower when SGX Nifty was up or why did Nifty suddenly spike up from the low of the day - here is one snapshot that tells you everything. The time stamp at the bottom are London time. If you place these charts side by side for anyday in the last few weeks, it has a striking similarity.
All interference work temporarily. Resources are finite. Once resources and words are exhausted, the underlying trend takes over.. with even more vigour.