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CCS/MSP430G2203: how does msp430g2203 iic hardware slave work ?

Part Number: MSP430G2203

Tool/software: Code Composer Studio

This screenshot is the signal graph captured by two oscilloscopes during 430IIC communication. One of the two msp430 serves as  hosts  and the other serves as slave. the C code provided by ti.

my question is :

Why does the iic host wait for a while after sending the slave address to receive the ack signal of the slave?

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