Kill two birds with one stone, meaning succeeding in doing two things by only one action

kill two birds with one stone; achieve two things at one stroke; serve double purpose (idiom)

arrow shot with the target unaware of / a cunning stance taken to harm an unaware one

archery

archer

to overrate oneself; to overestimate one's power or ability; pretend to have authority over something which one don't have (slang)

shield

verb; "a frontal spear thrust and an arrow in the dark"; Metaphor: various open and hidden attacks.

hidden dangers

to stab someone in the back unexpectedly

rocket

rocket launcher

arrow pointer

reach the point of no return

poison dart frog

archery

Archery

a porcupine

target

arrowhead

green arrow