MEMORANDUM **

California state prisoner Horace Mann Williams appeals pro se from the district court’s summary judgment for failure to exhaust administrative remedies in his 42 U.S.C. § 1983 action alleging failure-to-protect and retaliation claims. We have jurisdiction under 28 U.S.C. § 1291. We review de novo. Williams v. Paramo, 775 F.3d 1182, 1191 (9th Cir. 2015). We vacate and remand.

The district court granted summary judgment for failure to exhaust administrative remedies, finding that Williams’s grievance dated February 22, 2010, did not provide sufficient notice to prison officials of Williams’s failure-to-protect and retaliation claims arising from defendant Valdi-via’s statements about Williams and defendants’ subsequent conduct. However, Williams alleged that in December 2009 prison officials obstructed his attempts to submit a grievance regarding defendant Valdivia’s statements. Moreover, the district court did not expressly consider Williams’s evidence that he also submitted an emergency grievance in early February 2010 that described a retaliatory move to a cell block where a known enemy resided, an attack by another inmate, and threats to Williams’s physical safety. See Ross v. Blake, — U.S. -, 136 S.Ct. 1850, 1858-60, 195 L.Ed.2d 117 (2016) (setting forth circumstances when administrative remedies are unavailable); Reyes v. Smith, 810 F.3d 654, 658-59 (9th Cir. 2016) (under the Prison Litigation Reform Act, a grievance need not include legal terminology, legal theories, or provide personal notice to a particular official that he may be sued). We vacate and remand for further proceedings.

*496 We do not consider matters not specifically and distinctly raised and argued in the opening brief, or arguments and allegations raised for the first time on appeal. See Padgett v. Wright, 587 F.3d 983, 985 n.2 (9th Cir. 2009).

Cate’s motion to strike (Docket Entry No. 13) is granted in part. We do not consider Exhibit A to Williams’s opening brief because it was not filed with the district court. See United States v. Elias, 921 F.2d 870, 874 (9th Cir. 1990) (“pocu-ments or facts not presented to the district court are not part of the record on appeal.”).

The parties shall bear their own costs on appeal.

VACATED and REMANDED.