eddie,
bai si is the ceremony where you officially take your sifu as your sifu for life. it usually means the student becomes almost like family. and the student is expected to take care of the sifu in all ways possible.
IMO, the bai si isn't something that should be taken lightly, you don't have to go through a bai si to represent you are a life long disciple, but its official.
of course you pour and offer tea, and even a hong bow.........or in other words, indoor disicples.....
but im sure others will have a better explanation.
Hung Sing Boyz, we gottit on lock down
when he's around quick to ground and pound a clown
Bruh we thought you knew better
when it comes to head huntin, ain't no one can do it better