see Irasoc, 522 F.3d at 730. Even a single incident can amount to persecution provided the harm inflicted is grievous. See Irasoc, 522 F.3d at 730. Ahodikpe cannot prevail on this record. Nowhere does he mention any injury from that day, nor does he discuss the severity of his mistreatment, and the obvious inference is that he did not seek medical help. Instead he argues that several hours of detention coupled with some physical abuse is enough. But he neglects to provide any legal authority to support that particular contention. And our case law does not jibe with Ahodikpe’s proposition. A single episode of detention and unspecified physical abuse, lasting for less than 24 hours, does not perforce constitute persecution. See, e.g., Mema v. Gonzales, 474 F.3d 412, 417-18 (7th Cir.2007) (<HOLDING>); Zhu v. Gonzales, 465 F.3d 316, 319-21 (7th
holding that harassment threats and one beating did not constitute persecution holding that evidence of kidnapping at gunpoint interrogation and beating did not compel finding of persecution holding that minor abuse during brief detention did not compel finding of past persecution holding that a minor beating even in conjunction with threats did not compel a finding of persecution holding that evidence of multiple interrogations and 24hour detention did not compel finding of persecution