Guardian's pull works through obstacles
Yeah last night I went into a tower and I was pulled from about 5 paces from the portal, to where the portal made me enter the tower, then to the top of the gate and then back in front of the portal outside again.
I’ve also seen DH’s use the leap on the gate so they can jump off of it and into the inside.
It’s pretty impossible for games to prevent this. Roadhog in Overwatch being a prime example. I hope they try and fix it nonetheless though.