Teleport tubes

Why the hell on Olympus, sometimes when you get out of the teleport wire thing , you get the out of tube invulnerability and sometimes it doesn´t do sh!t . i came out of the tubes invulnerable for 2 seconds when noone is waiting and when there ´s people i come out vulnerable right away.. wtf is wrong? seus filhos da grande * de * * do * paneleiros de * riot estupidos de *