What we think happened was that Doolittle was chasing PrimPet around the courtyard and Primpet ran into the ferns where he lives and pulled up sharpish. Doolittle also jumped on the brakes but being heavier than PrimPet he has a longer stopping distance. Normally this wouldn’t matter but for the fact that there was a large tree in front of him.

Doolittle: Hmmmfffrrggghhhhh!
PrimPet: Blimey!

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And here is someone else who crashed into a tree.

Surgeons were unsure whether it could ever be removed.