Flight Crew Air Transport Pilot (ATP)
Distraction
ATC Issue All Types; Deviation - Altitude Crossing Restriction Not Met; Deviation - Altitude Overshoot; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Became Reoriented; Flight Crew Returned To Clearance
Human Factors; Procedure
On the SPIDR2 RNAV arrival; ATC gave us multiple step down altitudes; ignoring the altitudes prescribed in the arrival. Green Flight Path Angle (FPA) mode was used to make the descent. Outside of HEMME; we were told to descend via the arrival; so we scrolled the altitude down to 8;000. We then realized that we were at 10;600 just before HEMME; with an altitude restriction of 11;000-12;000. We stopped descending and climbed back up to join the arrival profile.To prevent the airplane from leveling off during our assigned descent; we switched the vertical mode from magenta to green. When told to descend via the arrival later; we forgot to switch it back.
Air carrier First Officer reported descending below the SPIDR2 Arrival published altitude depiction on the chart.