How to exclude the result of one view from another one?
One thing that pops to mind, albeit dirty, is to use php in the argument and do:


views_get_view_result($name, $display_id = NULL)
Loop over resulting nids of your hot topics then explode them out separated by + 
set the argument to exclude these nids.


Not the cleanest solution as it leaves you with php in the DB but it would work.