Excellent point. One theory I had was that the Yucatan meteor shocked the Deccan area so severely that it cracked and oozed for thousands of years. Then I read about the theory by an Indian scientist that there was a huge strike off the coast of Mumbai. I think he called it the Shiva Crater and his name may be Sattargee or something like that.
I know that there are at least strikes associated with the Chesapeake Meteor about 34MYA, there is also the Toms River crater and Popogai in Russia.
Geologists are still debating the provenance of what may be an impact crater (Shiva) off the Indian coast. What is there would indicate an impact considerably larger than the Chicxulub. It appears to be roughly the same age as the Chicxulub impact and the Deccan Traps. I agree with the idea that the single impact in Mexico was not enough by itself to cause the extinction event. The Mexican impact, the Deccan Traps volcanism and the possibility of the Shiva impact all occurring close in age would damage the environment enough to finish off the already weakening dinosaur line.