Houdini Sunday

Cole, the lesson horse, is also an extreme escape artist.  While at overnight horseshows he requires both a latch and a leadrope tied in a complicated knot to keep his stall door closed.  He crawls, jumps, and sometimes just mysteriously materializes on whichever side of the fence he wants, ninja style.  This morning I had him in a paddock constructed of metal panels with Samson, all the gates latched closed and secured.  I came home from church several hours later and Cole is in the pasture, happily grazing away.  The fencing is all still in place, the gate is closed and latched, and Samson is still inside.  How did Cole do it??  Did he leave the pen, close the gate behind himself and latch it?  I guess only Samson knows.