PHILADELPHIA — The final stanza of a nondescript Phillies loss was playing out Thursday afternoon when Bryce Harper popped his head out of the dugout. “We were like, ‘You know, should we say what’s up to Bryce,’ ” said Gavin McHugh, who was sitting in the Diamond Club at Citizens Bank Park with his buddies. “Yo, Bryce, what’s up?” Harper, out of the lineup for a fourth straight day because of a sore elbow, waved — “We were like, that’s awesome,” McHugh said — and continued to chat with Aaron Nola against the dugout rail. The friends soon noticed Harper curiously lift off his maroon Phillies ca…