idk who do i look like captain america? and if i had to guess it would be he only has one tactic which is shooting his way out and hits from behind seeing as they kill chief with one hit lol (im only joking )
chief can run at 65mph but it's not sustainable seeing as chief tore his chilies tendon the time he ran that fast.the average spartan runs at about 34.2 mph which is only 4.2 mph faster the Cap, and Cap isnt simply gonna let chief grab his shield, cap plans ahead for those kinda things. also Cap broke the Hulks jaw in the comics with his fist , also cap is stronger, tougher, faster and better trained that an ODST so no guaranties Chief can do that to Cap.
honestly there are a few ways this can play out, one side barely edges out the other, since they both have insane bullet dogding reflexs they swing and miss for hours then call it a day, they both decide to work together and kick buttock together, or (and my favorite scenario) Cap pulls rank on Chief and wins that way lol
oh! also you have to realize Cap is use to fighting those way stronger than him and win against them so this situation isnt new to him