I am so baffled as to why the guy would dashed across the road. For the past few days, I drove past the same junction myself and made some observations. The junction is complex. Vehicular traffic is constantly switching from 1-way to 2-way and vice versa. The traffic lights at the junction governs 3 different vehicular flow. The order of light switch is as follows:
a) Vehicles from Jalan Anak Bukit going straight towards Clementi Road or making right turn onto Upper Bukit Timah Road (towards Woodlands).
b) Vehicles from Clementi Road making right turn onto Upper Bukit Timah Road (towards city).
c) Vehicles travelling straight along Upper Bukit Timah Road (towards Woodlands).
If you are stopped at the junction, you have to wait for the set of lights to switch 3 times, allowing vehicles from the other 2 roads to pass before you turn comes again. The guy was crossing Uppder Bukit Timah Road at the lights outside Bukit Timah Plaza. So the right time for him to cross the road is when vehicles are turning onto Upper Bukit Timah Road (towards city) from Clementi Road. He dashed across at the time when vehicles were either travelling from Jalan Anak Bukit going straight towards Clementi Road or making right turn onto Upper Bukit Timah Road (towards Woodlands). The latter is the route of service 985.
A bit of speculation. I think the guy must have seen vehicles stopped in front of King Albert Park and vehicles started travelling from Jalan Anak Bukit towards Clementi Road. He then made the assumption that it was his turn to cross. as he dashed across the road, he might not have seen vehicles making the right turn from Jalan Anak Bukit onto Upper Bukit Timah Road because these vehicles will typically travel slower than those going straight. The driver might not have spotted the guy too since he was banking towards the left side of Bukit Timah Road. The guy came from his right side. Upper Bukit Timah Road is a 5-lane road. The driver's angle of view might not be that wide to spot him.
Its unfortunate but totally avoidable. If people would just follow their lights, be it drivers or pedestrians. I still stand by my initial point of view. The bus had the right of way.