To repeat the start of my above post "One cannot get a positive ID from this picture". So just tell your friend the truth - they cannot be positively identified. It just my opinion that they are a small species of ven. By the way, my apologies Chris for assuming that you had taken the shot.
The photo shows green and blue colours well rendered, along with some pale brown leaves amongst the predominantly grey leaf litter, so colour can be used.. I can see two animals, one clearer than the other, and a piece of rope between, with what appears to be a metal tent peg attached (using magnification). The two animals appear mid to dark grey.
There are only a dozen vens , a couple of colubrids and and couple of pygopods found in the area. Colour and shape can be used to whittle that down to a few possibilities. that can be further reduced if one also considers behaviour and geography. For example, one can rule out things like CTS, Tiger, juvenile Brown, Stephen's Banded, RBB on the basis of colour, and things like BTS, Death Adder, Burtons on the basis of shape. While saying that, I must admit there is an outside chance they could be unusually dark specimens of Common Scaly Foot, although I think it unlikely. Its possible, just not very probable.