To further corroborate the statement that the process pause in "Mark mode", e.g. during a mouse click or drag inside the cmd.exe window borders, but halts any operation only after completely finishing with the instance in progress, I offer an indirect proof:
[1378:000f][2018-10-08T13:26:20] END: Verifying package "AndroidEmulator,version=26.0.0.2"
[1378:000f][2018-10-08T13:26:20] BEGIN: Verifying package "AndroidImage_ARM_API23,version=20.0.0.3"
[1378:000f][2018-10-08T13:26:20] Verifying package 'AndroidImage_ARM_API23,version=20.0.0.3'
[1378:000c][2018-10-08T13:26:26] SHA256 verification for 'AndroidImage_x86_API23,version=20.0.0.3\x86-23_r20.zip' succeeded. Hash: X
[1378:0025][2018-10-08T14:09:03] BEGIN: Verifying "AndroidImage_ARM_API23,version=20.0.0.3\AndroidSDKPrivateInstall.ps1"
[1378:0012][2018-10-08T14:09:03] BEGIN: Verifying "AndroidImage_ARM_API23,version=20.0.0.3\armeabi-v7a-23_r20.zip"
[1378:0012][2018-10-08T14:09:03] Authenticode verification returned 0x800b0003 for path: AndroidImage_ARM_API23,version=20.0.0.3\armeabi-v7a-23_r20.zip.
[1378:0012][2018-10-08T14:09:03] Retrying validation for: AndroidImage_ARM_API23,version=20.0.0.3\armeabi-v7a-23_r20.zip
[1378:000c][2018-10-08T14:09:03] Authenticode verification returned 0x800b0003 for path: AndroidImage_x86_API23,version=20.0.0.3\x86-23_r20.zip.
You are looking at the logging stream of a Visual Studio installation where the Visual Studio Setup Command Line Utility is verifying all the installed workloads.
At 13:26:26 I clicked the inside the Command Prompt window. The Output to screen halts till 14:09:03 when I will have hit Enter to exit "Mark mode".
Now notice that after 13:26:26, the process finishes to check x86-23_r20.zip hash, the message "succeeded. Hash: X" and restart with another file at 14:09:03, the message "BEGIN: Verifying "[..]AndroidSDKPrivateInstall.ps1"
During the pause Visual Studio Setup Command Line Utility concluded the verification of the file that was processing, and at exactly the time when the control was to be returned to the console, started a new hash check work.