Board Thread:Questions and Answers/@comment-82.217.147.161-20150219190950/@comment-10412586-20150220130229

Seriously though, the reason there's still spikes there is either you missed an enemy(you should go back and kill him) or the game has bugged itself.

If you didn't miss anyone, restart the mission. If you are still stuck there, blow up the Gar. statue with an explosive weapon.