Know how pro-tem speaker's decision will decide Maha's destiny

The Supreme Court has decided to conduct floor test on Wednesday over Maharashtra's situation. The MLAs will take oath until 5 pm tomo and floor test will begin after that. Both, BJP-Ajit Pawar and Cong-NCP-Sena are adamant on their majority numbers. 
The decision will be taken by pro-tem speaker and he will chair the floor test. 
What is pro tem speaker and how he will affect Maharashtra's destiny? Watch the video to understand.