Tom is willing to vouch for Willie, whom he’s only known for about a day, when Mr. Miller stereotypes “this London lot” (i.e., the children evacuated from London to Little Weirwold) as shoplifters. This vouching shows both Tom’s generosity and his fast-growing attachment to Willie. Meanwhile, Charlie Ruddles’s prediction that Tom and Willie will be “gassed to death” unless they have masks recalls the Holocaust (1941–1945), the Nazi German genocide against people of Jewish descent, in which many Jewish civilians were gassed to death. Though the Holocaust had not yet begun in 1939, the indirect allusion to it here reminds readers of how many civilians as well as soldiers died during World War II.