Randy Johnson is determined to help the Giants out of the bullpen this season. San Francisco is sliding out of contention, but he remains driven. "I felt I owed it to everybody in this clubhouse to come back," Johnson, who will throw a simulated inning Monday, told the San Jose Mercury News. "I owed it to the ownership, and I owed it to myself. "It would be easy at age 46 to say, 'OK, well, I've got a torn rotator cuff. I'm not coming back.' But I didn't do that when I had any of my knee surgeries or back surgeries. Why should it be different now? "After 21 years of coming back from things, I don't want my last memory to be walking off with a trainer."