The best way to program is not the lazy way.
You can never make anything useful if you always do things the lazy way. Eventually, it will come back to haunt you when you want to add a new feature or expand your program's code, even in assembly.
The correct way would be to disable the scrolling altogether.
If one kind of boolean condition is true, then jump to someplace, and directly render the facepic on top of the message box.
If that boolean is false, then use the normal scrolling method.
If you do it the non lazy way, as described above using the assembly equivalent of an if statement, then you can freely choose
between scrolling and not scrolling by setting a flag in TSC, and then reading that bit from the flagdata using ASM.
However, the "just scroll SUPER fast" way makes it impossible to have 2 options. Therefore, it is not as generalized as using
an if-statement and two cases.