H1B transfer during Extension

[nmurali82]

I hold a H1B visa abd work for employer A  and my current Visa/Petition expired on 30-Sep-2015. My employer A has already filed for My extension in July 2015 and it is still under Processing by USCIS.

I have new offer with Employer B and H1 tranfer was submitted couple of weeks back and it was approved on 30-Sep-2015.

I have already resigned my Job with employer A and hoping to join Employer B soon . Can I still continue to Work for employer A using the extension Filled for one more month (Till 30-OCt-15) before I join Employer B .

Is there any way that my current extension filled by employer A can be revoked or cancelled by my Employer A during this time .

 

Your Help is truly appreciated. 
Thanks in advace.