"The next step is to tie in the lines so that they flow smoothly. We can't leave them like this or the game will get confused..."
At this stage we have lines 19 and 20 written to do what we want, but the game would never use them, because none of the other code lines lead there. So this is what we will work on next.
Line 7 branches to hex FE (decimal 254, exit true) or hex 0D (decimal 13).
Open up the BHAV Edit Window again and go to line 7, and we see the decimal values.
Change the value for "next line if true" from 13 to 19.