When hit by a shulker you can use an ender pearl to quickly get to the ground. If you do this from high enough you will get the "great view from up here" advancement. Under normal circumstances this advancement is obtained by floating a certain distance up with the levitation effect. Honestly getting the advancement by moving down instead of up is pretty funny, but obviously not intended. Maybe a new advancement can be added "great view from down here" which activates under these circumstances intentionally.