I'm the person who took those photos.
I saw that 2 teams went intp Seibu Department store in Tsim Sha Tsui for a while.
Then two teams ran to the intersection of Nathan Rd and Haiphong Rd.
I tried to run and catch them but there were many people on the streets.
One of two teams go on a cab and another team of 2 girls call for another cab.
However, it seemed that the cab driver didn't understand their English. So the cab stop on the road for around 4 minutes and then go away too.