This is a super interesting question and itād deserves an equally interesting answer that Iām not sure I can provide ācause my English is a bit wonky :/ but Iāll sure try and maybe you can go search some papers on the matter because this is a great topic
Here, weāre talking about light and shadows and how they work when a source of light hits something. In this particular case āthe cemetery scene between Buck and Eddieā the shadows are dark and defined and a bit long so basically this tells us itās a sunny day, clear skies and the sun isnāt at its zenith but probably not too much low on the horizon. Simply put, itās approaching sunset. (well, itās a simplification because the rotation of the earth on its axis changes the shadows according to seasons and location so itās much more complicated than thatā but weāll try to keep it simple, k?)
Before we get to the point, weāre going to take a slight detour to understand the basics of how light and perspective work so please, bear with me. The light travels in straight lines until it hits an object, right? Thus the shadow forms in a straight line wherever there is an opaque object between that and the sun. So why when we are looking at shadows theyāre not parallels but they spread in different directions?
Perspective and the so called vanishing point(s).
A common example used in classes (but also a very good one) is that of the railroad tracks
the lines are parallel but converging on the horizon and THAT is the vanishing point. And we know the railroad tracks never touch, of course we do, but weāre looking at ground level, not from above, so our eyes see it that way. These are the basics of perspective.
But how does it work in relation to a single light source? In this case the sun? Even light and shadows have their vanishing point, very specific ones at that and Iāll try to draw some visual examples to reach the Buddie scene at the end.
as you can see the two people are not touching but their shadows do because they are NOT on the same ādepth of fieldā (does it make sense? I hope it does).
another example on actual photographs:
and finally the scene that concerns us:
so I hope my messed up (probably most certainly a bit imprecise) drawings are clear enough and that I also made the point of what I was trying to explain. Maybe someone who knows English better than me can expand on this tread or, you know, help me explain things better lol
BTW, this is just the technical part, but as far as speculation goes I sure as hell know this was INTENTIONAL. Weāre supposed to see their shadows (dark and defined on the ground) connect despite Buck and Eddie being slightly apart (aka misunderstanding between the boys). The writers know what theyāre doing, and Buddie is coming at full force.
Hope this was what you were asking hon, have a great day!