Since watching this film and certain scenes over and over again.I found at the beginning that Jack was teasing Ennis like when Jack is standing in front of his black truck looking at Ennis walks forward then turns back and leans on his truck.Also when Jack is on the horse when there going to for the sheep and he has the horse going around in a circle like in the rodeo and Ennis gives him a strange look.I am not sure though.I like to tease my lover to and she enjoys it,sometimes to much but enjoys it anway.Just sort of wondering,maybe I am wrong but it sure looks like it.
I don't think much "teasing" is going on in that early scene when Jack is mounted and his horse keeps going in circles. Maybe he is trying to display his horsemanship to Ennis but somehow I doubt this. The script reads "Jack's on a horse - crowhops." I know almost nothing about horses and horse riding so don't know what "crowhops" implies. Any horse-riding member of this board able to help us out? To me it suggests that Jack hasn't got full control of the horse yet.
Either way, all it elicits from Ennis is a warning to Jack: " that horse looks like it's got a low startle point". However, it's a warning Jack blithely ignores, saying "I doubt there's a filly can throw me." Alas, we learn that this is an empty boast on Jack's part as the filly does later manage to throw him, flattening Jack's harmonica in the process.
The contrast first established here and later developed - think of the scene where once more Jack's horse is "crowhopping" before Jack is able to bring it under control and set off for the pup tent above - is between Jack's limited ability with horses and Ennis's quiet professionalism. No horse "crowhops" when Ennis mounts it. Whether leading the mule pack up Brokeback or riding flat out across the upper pasture it almost seems that Ennis and his horse are one. For me, it's always a pleasure to behold.