Unfortunately for Peter, Snape wasn't the sort to think of scones, as his scrawny build testified. He took a sip of chai, marshalling his thoughts.
He didn't react to Peter's revelation, because of course to him it was no news at all. Instead, he said to Al, "I'm not sure my presence there would be welcome." Though from a strategic viewpoint, I should go, if only to see to security. The mourners will be too distracted to do anything better than a half-arsed job. If they manage even that.