"For you shall not bow down to another god" (Exodus 34:14). This is to render one liable for the act of bowing down, even when it is not the customary manner of that idol's worship.
Liability for Bowing to a Foreign God Even Outside Its Worship
Mekhilta DeRabbi Shimon Ben Yochai 34:3
כי לא תשתחוה לאל אחר לחייב על ההשתחויה אפילו שלא דרך עבודתה בכך: