When you delete the contents of the search box it returns to the previous screen, which makes sense. But it also takes the focus off the search box, so if I've finished with one search I can't delete what's in the box and immediately start another one, which is what I'd like to be able to do. Once the cursor is in the search box I expect it to stay there unless I click somewhere else or use the X to clear the search box (that's more like dismissing the whole thing).