Using only brute force to create a crack within the dimension was not a simple action to do even if it was for Joshua or any other legendary warrior. Even those mages who mastered the art in space magic had to go through detailed calculations before creating a pathway through the dimension. Different complex runes and arrays had to be laid. Utilizing the natural power of the world, they could bend space to create their desired path.
Perhaps only the gods or sages had the almighty existence to play around with space freely with their own will. Their power could easily create the phenomena fitting to their own image.
Although Joshua could not create his own dimensional space to travel on his own, he still had the capability to reopen a pathway which had already existed.
Just like this moment.