Hi Ajit,
The image of the debug run you have pasted does not shows that the error came in the 'getTagAndWellFromExcelPCOQry_0' action block.
When any error occurs in the action block that should come as red in the debug run.
And yes you understanding is correct.
catch_1 Assignment_8 and Throw_0 should be executed and then after catch_0 Row_1 should be also executed.
Regards,
Rohit Negi.