More horse watching - social behaviour

Came across this video I took a couple of years ago. Tigger meeting Duke, the stallion who lives at his yard, for the first time. Tigger's posturing is obviously attention grabbing. You can look up any good book on horse behaviour and find descriptions of this kind of sequence of behaviour. But what I find interesting is the more subtle interactions.

For example, at the start of the video, the older, wiser Paddy (grey) is not particularly interested in Duke, it is clear that his communication is with Tigger (the touch behind the elbow, then sniffing). He moves a little way from Tigger then waits until Tigger joins him. When Tigger then turns back to Duke, Paddy considers going with him but doesn't. There's very little written about these kinds of interactions.

I would say it looks very much as if Paddy recognises that Tigger's interactions with Duke aren't very wise, and is suggesting that Tigger should move away/calm down. It's a shame that the moments which bond horses, or demonstrate an existing bond, are not given more attention.