In pic 3, you can see that just before the OHE pole with the 'Rise Pantograph' sign, there are a few criss-cross connections on the catenary. Usually such connections are done just before neutral or dead sections where the subsequent section of wire is insulated from the previous section.( In pic 5, you can see this from the other side). The OHE carries power till this pole, and there, it switches to the 3 cables to go to the other side of the bridge. The short section from this OHE pole till the bridge is insulated and separated from the remaining part. It is present to give mechanical continuity to the pantograph.