swimming with horses

Once we came up to this lake (silver lake) and took our horses swimming.  Most people don't think of horses as swimmers but they are actually really good swimmers.  It is a fun experience swimming with such a massive graceful animal. One of these times, one of the horses got spooked while swimming and started panicking. His reins got caught under his hoof and every time he kicked it dunked his head under.  It is very dangerous to go near a panicked horse so the person riding him (I can't remember which sibling  it was) hopped off and swam for shore.  We knew the horse needed to calm down.  We all knew it was a matter of time for the horse to get exhausted and then we could go in and save him.
At this point some random person swam across the lake to the horse to get him back to shore.  I remember my dad being worried that the stranger was going to get himself hurt because it was obvious he knew nothing about horses.  Once the horse was tired we swam out with the other horse and unhooked the reins bringing the frightened animal back to shore with the stranger in tow.
The thing I remembered most about that experience was how calm and collected my dad was.  He wasn't nervous so we weren't nervous.
That's my dad cool as a cucumber.