Let their table
a table (as spread out); by implication, a meal -- table.
become a snare
a (metallic) sheet (as pounded thin); also a spring net (as spread out like a lamina) -- gin, (thin) plate, snare.
the face (as the part that turns); used in a great variety of applications (literally and figuratively); also (with prepositional prefix) as a preposition (before, etc.)
them and that which should have been for their welfare
safe, i.e. (figuratively) well, happy, friendly; also (abstractly) welfare, i.e. health, prosperity, peace
let it become a trap
a noose (for catching animals): by implication, a hook (for the nose) -- be ensnared, gin, (is) snare(-d), trap.