Unlike the Spiders who had been forcefully teleported inside the isolation array, Eren could still access his runic imprint to teleport to any place inside the array. He could do it a bunch of times before the runic imprint stopped working.
This was why the Stardust guild members were confident in taking down the Spiders inside the array even when they were short in numbers. They could use their runic imprints strategically to get away from any threatening situation. They could also use teleportation inside the isolated space to launch a surprise attack on Spiders.
Thus, it was no wonder that Yana had called these isolated arrays the Spider-trapping spiderwebs.
Eventually, one of the eight Spiders got over his surprise and asked in a cold voice.
"Ariadne… what the fuck are you doing?"