It latched onto the other racer because they were ahead of you. I slow down when I hear the blue shell coming (mainly if 2nd is close behind but if not then I just keep going full speed) and usually if someone passes you it will go for them instead (although I have seen it go for me still even though I slowed down to 2nd/perhaps too late to latch onto the person that just took 1st over). I was happy to see that the horn can blow the blue shell away but I have only been able to use it to deflect a blue shell a couple times (usually red shells start coming when you have horn in 1st instead of the blue shell).
The flip dodge was cool though.







