Elliott Theory states that expanding diagonals can only be a leading wave or an ending wave in bigger structure Here I would say we are probably witnessing ending 5th wave expanding diagonal of some sort of bigger structure. Expanding diagonals can be identified by ABCD with quite strict structure:
In an expanding triangle, wave C is usually 161.8% of wave A , wave D is 161.8% of wave B, and wave E is 161.8% of wave C.