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TUSS4470: Time of flight calculation and algorithm

Part Number: TUSS4470

Tool/software:

Dear Engineers,

I want to measure time of flight by using TUSS4470, I did a research and I noticed I need to measure the time between OUT4's START and STOP pulses, my question is which time we are referring to in the following image? We want to measure TIME-1 or TIME_2?

My second question would be, what the big pick that initially we see, it is around 3V, is that also echo? then what this the difference between this pick and second which is around 1 V?

I can also see this in my oscilloscope:

Basically, why VOUT pin starts from a high value and the starts to reducing?

Regards 

Thanks