The Georgetown Hoyas hit one of those almost magical offensive streaks that are both the joy and the despair of their fans in the second half last night and shot down muscular Loyola of Chicago, 80-70.

Once again the 14-5 Hoyas showed how efficient they can be when their rhythm and their running game is in gear.

Tied at 44-44 and playing lethargically, Georgetown suddenly caught fire on back-to-back, three-point plays by Ed Hopkins and Ai Dutch.

For the next 11 minutes the Hoyas could do little wrong, producing 32 points in that span of 19 trips down court.

"They cruified our defense," said Loyola coach Jerry Lyne, who has turned around the Loyola program with three junior college blue-chip players. "They hit every 15-footer in sight.

"I don't know where my guard (Ted) Dufelmeier was, but he sure wasn't on John Duren," growled Lyne.

It was Steve Martin (13 points) and Derrick Jackson (17) who led the Hoya surge. Martin hitting three buckets and dishing off four splended assists and Jackson scoring three times at the end of fast breaks.

But Duren did the final, conclusive damage. He canned five straight shots, four of them jumpers after overpowering the slender Dufelmeier with spinning one-on-one moves, as GU moved from 44-44 tie with 13.03 left to a commanding 76.64 bulge with 1:55 remaining.

"Sometimes John wants to please me too much," said GU coach John THompson. "He tries to run the offense from the outside instead of just taking his man and crushing him with penetration."

GU's transformation from first half to second was total. The Hoyas, in their third locally televised game this year, drove away many a viewer and infuriated their coach with an almost nonchajant first 10 minutes that left them behind 21-12.

Thompson called time and replaced Tom Scates. Hopkins and Dutch with Gary Wilson, Mike McDermott and Martin up front. The substitutions plus a full-scale chewing out at courtside, were what the doctor ordered.

"We couldn't outphysical them," said Thompson, using the coaching vernacular, "so he had to outquick 'em."

In truth Loyola's 6-foot-9, 225-pound Houston Lloyd were just the sort of players GU has trouble with. Both snatched rebounds away from Hoyas and dominated the inside.

Sparked by Loyola's violence, the Hoyas gradually awoke, diving on the floor more in the last five minutes of the first half then they sometimes do in five games.

That fierce hustle hardly the Hoya trademark. may have saved the game. With no Hoya in particular doing thedamage, but all leaping for loose balls and offensive rebounds, that 21-12 deficit became a 36-31 halftime lead.

That made Lyne furious. "We should have been up by eight to 12 points at half and instead we're down by five. That turned the game. They wear you down in the second half.

"We got dumb at the wrong times. Just when we were giving them trouble we throw up about four shots from the twilight zone and made a buch of other no-brain plays. We beat outselves.

Loyola, curiously, played some of its best ball during the second-half streak when GU pulled away.

Dufelmeier made three straight long range shots, but his performance was nothing compared to C3 swingman Tony Parker who went eight-for-eight to start the second half hitting five in the space of seven Loyola trips downcourt.

But GU was so hot, playing as a team with Martin, Duren and Jackson making the passes, that they Hoyas gained two points on the 10-7 Ramblers during $99[word illegible]$120.

"Most of my teams have been second half teams," said Thompson. That's not a bad half to do well in."

Certainly the Hoyas showed both sides of their mysterious psyche last night, playing as poorly as they have ad year at the start, but leaving the crowd of 2,800 with the memory of as torrid a final 13 minutes as McDonald Gym is likely to see.

"We had our chance to beat them," said Lyne. "Their big kid (Seates) wasn't quick enough.

"And we're used to playing a rougher brand of ball in the Midwest with Big 10 officials. This gym and these officials are like paradise compared to the robbery we're used to. yeah, we had out chance, but they've got a lot of talent at guard and small forward too. And they just keep coming in waves."