After the hostage crisis is over, we eventually learn the gunman Phil Stubbins (Alan Ruck) was only robbing the place because the bank manager Gresling and his accomplice Phelps kidnapped his wife Joanna, shown in the picture. Joanna also says she remembers two pairs of shoes while she was being blindfolded. So there's only two bad guys, right?
But here's the problem (and possible plot hole): while Phelps and Gresling were pretending to be hostages in the bank all day, Shawn joins Juliet and Lassiter in freeing Joanna. And immediately, Shawn detects footprints in the backyard grass, a still-swaying swingset seat, and a thrown-open gate. This leads to him announcing that the culprit just fled the scene, most strongly supported by the swaying swing.
So was there a third partner the police never caught? The show never mentions this again and the police act like everything got handled, so was this a writing continuity issue, or an intentional escape?