[5-6] veitið … vitið ‘drain … find out’: As noted by Merl 2012, this is 2nd pers. pl., contrasting with the sg. lát ‘let’ used in l.1. The interpretation of Merl 2012 is that Merlin turns from addressing Vortigernus to addressing his workmen. More likely, however, is that implicitly Vortigernus is the speaker of ll. 5-10, as indicated by the following sentence in DGB (see I 14, Note to [All]).