In a deleted scene the t-1000s feet where blending into the floor (malfunction) whenb he was impersonating sarah connor. Thos is how john could tell his mother apart rom the imposter t-1000(You see him looking down and noticing the feet followed by a shot of the t-1000s feet melding into the floor)f. I think it was a mistake cutting those shots of the t-1000 as he was malfunctioning.
So with these cuts back in the movie it made sence for the t-1000 to try to get the real sarah connor to call John as this was more optimal then what happened later and helped expose the imposter.
The T-1000 must touch (sample) what ever it intends to imitate and it had just speared sarah connor. Its not clear how well it sampled the T-800 at this point (even though we know they had fought hand to hand for a few scenes already at this point). The real question is why was Sarah Connor still alive considering that "Typically what ever the t-1000 samples and imitates is terminated" as explained by the t-800. The t-1000 had already sampled sarah connor but didn't terminate her which is what really what tipped off John as he then saw two sarah conners indicating onee was the imposter.
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