digital theodolite part3-taking measurements 

at 2:10 is the first reading of vertical angle and first reading of horizontal angle , you use the reading at 4:21 for each and deduct from the first at 2:10 for each horizontal and vertical. the vertical angle means the height between point A and B vertically which is very low. which is around 94 - 86 = 8 degrees

make it positive what you need is just the absolute difference without signs