Running the Remove Sophos Anti-Virus app deletes the two kernel extensions (SophosNetworkInterceptor.kext and SophosOnAccessInterceptor.kex), but doesn't unload the running kexts or prompt for a reboot:
$ kextstat | grep "sophos"
128 0 0xffffff7f807e6000 0x7000 0x7000 com.sophos.nke.swi (9.0.53) <4 3 1>
142 0 0xffffff7f807c1000 0x5000 0x5000 com.sophos.kext.sav (9.0.61) <5 4 1>
This thread was automatically locked due to age.