sañcintya — having thought; ari — their enemy; vadha — for killing; upāyam — about the means; bhīmasya — to Bhīma; amogha-darśanaḥ — the Supreme Lord, whose vision is infallible; darśayām āsa — showed; viṭapam — a tree branch; pāṭayan — tearing apart; iva — as if; saḿjñayā — as a sign.