Coming back to the possible symbolism of the two different ways of Jack seeing Ennis leaving;from the confrontation scene onwards,all we can see between both of them are comparisons;we compare the embrace after Jack's tragical speech and Ennis not less tragical reaction with the dozy embrace.A dispairing embrace,really hopeless,between a man who had lived by hopes-Jack-and in these moments he saw how they're dissapearing,the same than perhaps his love-if not,the possibility of living it fully-;and another man who had never lived for and by hopes because he never hope anything from himself really.
We compare Jack's reaction at the point of giving up and perhaps,cut the relationship with Ennis after so many years of denials and renouncements ;and who reacted with tenderness,however,when he saw how his partner broke down and seemed to lose all control over his emotions and have his shield cracked.We compare this with young Jack's reaction ,completely given to the man he loved,who,by his side,gave him the same love proofs than his mother gave him when he was a child-as they're the two persons he loved him and he loved the most in his life...-;but always taking control of the situation,with his shield well put around him and knowing inside him that when summer was over,their relationship would be also over.I've already spoken about the different Jack's glances when he saw Ennis leaving,but for me the difference lies in that after the dozy embrace,Ennis is running free from his lover,knowing he'll come back by night to be with him again,strong and happy in his horse as their new love then.The Ennis the older,sad and tired Jack watched leaving is running from his lover with a pain inside,not being free from the environment,from the society and from HIMSELF;neither he nor Jack-specially this one-knew really when they are going to see themselves again,even if they're really going to met again-we know after that they NEVER met again for unlucky reasons-.Their love is also sad and tired and they didn't feel free,so there's not a quick horse,but two quiet horses caged into an old truck...Comparisons and symbolisms that go together,IMO,if it makes sense.