
Ruediger T. answered 08/15/21
Language expert - German, English, French - 30 years experience
It seems to me the answer has to do with the position of the adjective evident. Adjectives can be employed 'attributively' and 'predicatively'. When an adjective is to the left of the noun it modifies it is called attributive. If it is to the right of the noun it is a predicative adjective. The latter is, normally, tied to the noun by a 'linking verb'. Example:
He put on his red shoes (attributive adjective)
His shoes were red (predicative adjective, the linking verb is were, a form of to be)
Sometimes, the linking verb can be omitted: The murderer left the room, his shoes ( ) red with blood.
Based on this analysis, we could perhaps argue that his delight evident is a clause with the linking verb omitted or merely implied: his delight (was) evident.