User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-3318452-20120626153910/@comment-5581583-20120719200707

This is a great question boris... Gobul's pretty small in height... The only thing I can think of is this:

(beware, something is about the sound stupid) Notice how Gobul puffs out when pushing out his spikes. Perhaps something triggering by him puffing out like that releases the spikes from a retracted state, much like some lances the hunter uses. In other words they retract out like a toy light saber.