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LM3424BKBSTEVAL: IS and GATE waveform when R6 is removed

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Part Number: LM3424BKBSTEVAL

Hi team,

I did an experiment using LM3424 buck-boost EVM that I removed R6 and then test the GATE and IS waveform. Power on and I found that IS and GATE has the same  peak value(nearly 6.9V, equal to VCC) and frequency, their waveform are basically the same. 

What I want to know is: Why the IS voltage will be the same with GATE voltagewhen the NMOS is turned on, rather than VIN after I remove R6?

Thank you


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