Have a look at position of the engines relatively to the fuselage - see the photos:
Photos: Boeing 737-8F2 Aircraft Pictures | Airliners.net - both engines seen from the left relatively to the flight path, let's say engine A and engine B left to right (not necessarily # 1 & 2). Note A's spinner is clean, B has spinner covered in mud and blades bent.
Photos: Boeing 737-8F2 Aircraft Pictures | Airliners.net - this is engine A with remains of its pylon visible
Photos: Boeing 737-8F2 Aircraft Pictures | Airliners.net - engine A partially visible on the right-hand side
http://www.geenstijl.nl/archives/images/ANP-9259316.jpg - engine B (mud on the spinner).
Now, note both are on the right side of the fuselage - and the flight path. What could have moved engine #1 that far perpendicularly to the speed vector were effects of the inertia of its fan suddenly halted by crushed cowl and/or gyroscopic forces. Would a windmilling fan have enough kinetic energy to move a 2,4 ton engine that far?