Mostly to annoy Indian Charlie ... here's my take on it.
First contact: (a strong brush or slight bump between TC and Setsuko)
Fault: mutual (Setsuko is getting in slightly under a strong right handed whip - Twirling Candy is a tiring horse and having trouble staying straight despite Rosario's best efforts)
Prior to second contact:
Chantal is going left handed and is going to look to come out and do some herding - Twirling Candy is coming in a bit.
Second contact:
Fault: mutual between TC and Game On Dude. The latter is coming out to herd - the former is coming in a slight bit. Because Game On Dude's hind gets bumped - it will appear like he mugged TC.
Basically - No one can be placed behind Twirling Candy. He was involved in mutual contact with two seperate horses. He was not fouled.
The only question is - did the chain reaction bump Setsuko took through no fault of his own cost him a placing?
If you believe it did - Game On Dude and Twirling Candy should both be DQ'd. Since Setsuko finished ahead of TC - you'd only be able to DQ Game on Dude and place him 2nd.
Would I have DQ'd the winner? No. Would I have expected a DQ of the winner? At most tracks - yes.
If you're willing to DQ the winner - you would also have to have been willing to move Setsuko up from 3rd to 1st had Twirling Candy not quit.