The answer to your question is hearing. the reason why is because you need to be able to hear an explosion in order to not that its an explosion. and with the second, its talking about the thumping, wich u need to be able to hear in order to call it thumping. i hope this answer helps.
giving punnishments, bring this theme more public so people are aware of it, show really bad side of this theme so people would understand that its a big problem.
