One of the usages of が is to describe something that is happening in front of the speaker's eyes. I have read many example sentences in books and online, they are often used with 自動詞 with ている and with あの, その... like Example 1.
However, I wonder whether 他動詞 can be used also. And also can we add articles before the noun? And do we have to use ている？
And Finally, does it have to be something happening in front of the eyes?