Weird experience on the helix bridge

I (male) was walking on the helix bridge, listening to music on my earpiece and gazing into the scenery. Out of a sudden, I sense some weird energy around me. To my utter shock, I see 2 ladies in their 20s had just ran up to me and were walking EXTREMELY close to me on both my left and right side. Mind you, I was walking on the extreme left side of the bridge, and there was PLENTY of space all around me.

I immediately stopped walking, backed up and just stared at them. I proceeded to continue walking on the extreme right side of the bridge now. One of them started to try talking to me, so I took out my ear piece to listen to what they were saying. She said "can you take a video of us?" I just said "No." and walked away from them.

After I got to the end of the bridge, I turned around to see if they were still there, I saw the two of them running to the end of the bridge. I just continued on my journey and crossed the road.

Don't know what they were up to, but it was just so odd.