Answer:
Because of the pandemic.
Those "heroes" can be infected by the virus because they are just humans who can teach, unlike superman, batman, Jose Rizal*... you name it. Yet they're still trying their best to be able to sustain the needs of the students specifically to make them educated and well informed about the topics that will make them who they are in the future.
Explanation:
*cough, brainliest, cough*
