pratyanikam -- an enemy; manyamanah -- thinking; balabhadram -- Lord Balarama; ca -- also; mohitah -- confused; hantum -- to kill; krita-dhiyah -- having made up their minds; rajan -- O King Parikshit; apannah -- they set upon Him; atatayinah -- wielding weapons.

In their confused state, O King, they also mistook Lord Balarama for an enemy. Weapons in hand, they ran toward Him with the intention of killing Him.