As I understand the ETS system, turning it off only turns off the automated braking of individually slipping wheels. The traction system will still operate and its normal response to loss of traction is to take over engine speed to insure that the wheels have traction (a blinking triangle means that there is a loss of traction). It sounds normal to me, just slow down and let off the gas on the corner and you probably won't see the system "kick-in".