Wesker seemingly stood perfectly still as everything fell around him; as if the ceiling had collapsed everywhere except for on top of him. Alice, however, would have been able to tell that he had made use of his Uroboros-given powers to dodge everything in lightning-fast motions, giving the illusion that it had all fallen through him as if he were intangible.
He didn't appear the least bit surprised at what had just happened, however. Rather, he simply smiled. "Ahh. Right on time, Jill." Wesker looked upwards for a brief moment, and smiled his twisted, devilish smile, before turning back to Alice and Rain. "I would have loved to play with you, Alice, but I'm afraid business takes me elsewhere." With that, Wesker jumped straight up into the air, and through the hole in the ceiling. In midair he did a back-flip, landing next to Jill and his escape route. The computer - with none of the data that Alice wanted, and indeed no mention of anything related to Umbrella - was left perfectly intact, if caked with dust from the explosive.