“I do not have first hand knowledge of hitting someone in the head with a bat but...I have no doubt it would cause serious injury to you if I did it.”
So that fact that you know that getting hit in the head with a bat hurts makes you knowledgeable about something that you have no firsthand knowledge! I guess with that logic you could give a lecture on brain surgery as well.
And Timmy, please read the definition of firsthand knowledge:
‘Firsthand knowledge refers to something which the witness actually saw or heard, as distinguished from something he learned from some other source’
So no Timmy, watching ten innings on the net is not firsthand knowledge and does not make you an expert or qualify you to tell others who are qualified what and how they should do things.
Now Timmy, please step up your game or I’ll have to send you to the minor leagues.