Ted stood on a ladder near the laser level, to adjust the beam for Bob as he moved to each location.

Here Bob is sketching a line on a piece of scrap lumber where the laser line falls. Ted and Bob transferred this mark to various points around the perimeter...

...as well as on each post. For the posts, Bob just drew the line on a piece of masking tape. Now we've got quite a few reference points for setting the 2nd floor beams.