question:  Why did the dumpy man not start running when he picked up the suitcases?
context: Mine was no satisfaction, never earned me a penny—and now it had me fighting for my life in ... I had finished reading the Chronicle , folded and put it beside me, turned and looked out the window, expecting to see the San Joaquin Valley but finding only a sea of clouds instead. So I returned my attention to the inside of the plane, to the overstuffed gray-haired woman asleep beside me, to the backs of heads in seats before me, across the aisle to other heads, and down to the blonde. Inventory completed, I went back to looking at the clouds, knowing I should be thinking about the printing order I was going to Los Angeles for, and not wanting to. I had set my alarm for five-thirty because I had to catch the seven o'clock plane at San Francisco International Airport. This being earlier than I usually get up, it seems all I did during the night was feel my way past the escapement and balance wheel to see where the notch for the alarm was. The bomb was in a small bag—a woman's bag judging by the soft, flimsy things you'd never find in a man's—and I didn't know it was a bomb right away. One went to a battery and the other to hard round cylinders taped together. Quickly I went up past the train of gears to the alarm wheel. If this was anything like my own alarm clock, this one had something like ten minutes to go. It was forty minutes to Burbank and Lockheed Air Terminal. No, none of them would know it was there. We'd be leaving the valley for the mountain range north of Los Angeles soon, if we hadn't left it already. When it went forward, I pulled it back; when it went back, I pulled it forward. I pushed and pulled and didn't dare release my hold until it came to a dead stop.
output:  He didn't want to arouse suspicion unless he was spotted
options:  He knew there was a bomb and didn't want to jostle it before he retrieved the other contents  He didn't know there was a bomb so he had no reason to rush  He didn't want to arouse suspicion unless he was spotted  He was too big to be able to move quickly