Plugging the cables | 18: Demon's Den DMC: Devil May Cry Guide
Last update: 11 May 2016
Now you just need to solve a simple riddle. Notice that hitting a red mark on the ground with Eryx gauntlets make its parts move.
You need to adjust marks to generators, for example star need to be next to the generator with the same symbol. If you make it right, a part of the floor lights (1st screen above). Continue hitting the marks on the ground until all four marks match (2nd screen above). Now watch a cut scene what ends this mission.