PHILADELPHIA — Karl-Anthony Towns knows what Nick Nurse is going through. He has dealt with personal loss, and he understands how difficult it is to balance grief with the job. “I really wanted to give my condolences to him, I haven’t been able to talk to him personally, but I know it’s really tough,” Towns said unprompted Saturday. “I don’t know what he’s going through [exactly], but in a similar fashion I know how it is to have to show up to work and to have a lot of pressure on you to do something special when you’re kind of not fully there.” Karl-Anthony Towns looks to make a move on V.J. Edgecombe during the Knicks’ Game 3 victory. Charles Wenzelberg / New York Post Nurse’s brother, Steve, unexpectedly died April 29 at the age of 62. The coach didn’t miss any time with the 76ers despite the difficult loss, other than to attend Steve’s funeral Tuesday, an off-day between Games 1 and 2 of the Eastern Conference semifinal series against the Knicks. Before Game 2, he addressed it.…