Originally Posted by
vitruvian
We can say he hasn't done it in this story, because this story is what's been published. If we can fill in just anything we like to fill in the gaps, we can say that Doom volunteers at the ASPCA on Tuesdays with just as much reason. Okay, maybe nothing that silly, but still, there are limits.
We can assume that characters go to the bathroom, eat, exercise, watch a little TV, do the more boring parts of their jobs, and so on in between panels and issues, no problem. Based on what they actually say they are doing, we can assume a lot more that is not directly shown. But if it's something that's neither shown, nor told, nor routine, but important to the story, then no, I don't think we can assume that it happened when it's not actually anywhere in the story.