might as well mention this since i can, but whenever i find a bob user, i swap to megarock and ask them to send a bob at me, if they do, i kill the bob before saying "Thx for the food" and leaving, :D
Fun fact: if u use shukuchi abilitie and the rob user use abilitie during cutscene the rob user get killed instantly(i guess this is a bug or rob hates that guy...)