then filed an objection to the magistrate judge’s order, but, perhaps because the appropriate means to challenge the order would have been by way of a request for reconsideration rather than objection, compare 28 U.S.C. § 636(b)(1)(A) with id. § 636(b)(1)(C), the district court never addressed the matter before dismissing the entire action without qualification several months later. As the latter disposition effectively foreclosed the relief Ashby sought by way of default, however, we consider the matter to be properly before us for review.
We review decisions regarding default judgments for abuse of discretion. Dennis Garberg & Assocs., Inc., 115 F.3d at 771. Given the circumstances described above, however, we lack a decision from the district court actually reflecting the exercise of its discretion over this matter. From what we said earlier regarding the limits of an appellate court’s authority to fashion its own rationale for a decision entrusted in the first instance to the discretion of the district court, such a non-decision presents obvious complications. Nevertheless, given the prescriptive guidance of the applicable rules of procedure, we can say with confidence that an entry of default against Crowley LLC, before it had any obligation to file an answer, would have been incorrect as a matter of law. See generally Moomchi v. Univ. of N.M., No. 95-2140, 1995 WL 736292, at *1 (10th Cir. Dec.8, 1995) (unpub.) (discussing interplay between Fed.R.Civ.P. 55 and Fed.R.Civ.P. 12(a)(4)).2 Thus, as “it would have been an abuse of discretion for the trial court to rule otherwise,” Orner, 30 F.3d at 1310 (quotation omitted), we may affirm the district court’s sub silentio refusal to vacate the clerk’s note and enter a default judgment against Crowley LLC.
In sum, we hold that Ashby’s request for entry of default against Crowley LLC was properly denied prior to the dismissal of the case as a sanction under Rule 37. The latter disposition, however, cannot stand on the rationale expressed by the district court, though it may yet be a permissible exercise of that court’s discretion in response to Ashby’s unjustifiable resistance to the discovery of his medical records. We therefore vacate the order of dismissal and remand for further proceedings, including reconsideration of the issue of sanctions, consistent with the principles discussed herein. Finally, we note Ashby attempts to interject additional issues into this appeal by way of his reply brief. Under settled and self-explanatory circuit precedent, these matters are deemed waived. See, e.g., Stump v. Gates, 211 F.3d 527, 533 (10th Cir.2000); Reazin v. Blue Cross & Blue Shield of Kan., Inc., 899 F.2d 951, 979 n. 43 (10th Cir.1990); Abercrombie v. City of Catoosa, 896 F.2d 1228, 1231 (10th Cir.1990).
The judgment of the United States District Court for the District of Colorado is VACATED and the case is REMANDED for further proceedings consistent with this opinion. The motion to supplement the record is denied.
2
We refer above to the unpublished Moomehi decision because it provides a helpful summary and practical illustration of the interrelated procedural rules which govern our disposition. We do not mean to imply that the decision itself is binding; under our local rules, it is not. See 10th Cir. R. 36.3(A).