I reckon they could've used the long winch rope to pull the bogged one out by tying it to the tree, rather than getting the recovery vehicle bogged & tipped over? Or even use the recovery vehicle as a "joiner" between the tree & the bogged one?
Or may be the bogged one was way too bogged to do a slow winching but needed a quick "jerk" to get it out, 'cos the they were on the clock with the tide?

They looked like they had enough long length of the rope?!

https://www.youtube.com/watch?v=f8trkgFX6wI

Either way, a good lesson not to screw around with the tide.